Police Sergeant Exam

Drink Driving Limit UK: The Law, the Tests and the Penalties

The drink driving limit in England and Wales is 35 microgrammes of alcohol in 100 millilitres of breath, 80 milligrammes in 100 millilitres of blood, or 107 milligrammes in 100 millilitres of urine (s.11 Road Traffic Act 1988). Scotland's limit is lower: 22, 50 and 67. Driving over the limit is an offence under s.5 with an obligatory ban of at least 12 months.

Updated 2026-10-30 · 11 min read · Checked against official sources

"Drink driving limit UK" is one of the most searched road traffic questions, and drink and drug driving is a core part of road policing in the sergeants' exam. Candidates need the exact figures, the difference between the s.4, s.5 and s.5A offences, the preliminary test powers in ss.6 to 6E, the specimen procedure and the penalties. This guide covers each, with the figures checked on legislation.gov.uk and gov.uk.

Members of the public will find the limits, penalties and a plain explanation of "in charge" below. This page explains the law; it is not advice on a case. Anyone arrested can ask for the free duty solicitor at the police station.

This guide is a revision aid, not legal advice; the exam follows the 2027 Blackstone's manuals. Checked against legislation.gov.uk on 30 October 2026.

The drink driving limit in the UK

The prescribed limit is defined in s.11 of the Road Traffic Act 1988 for England and Wales. Scotland set its own lower limit in 2014 under the Road Traffic Act 1988 (Prescribed Limit) (Scotland) Regulations 2014.

Specimen England and Wales Scotland
Breath 35 microgrammes per 100ml 22 microgrammes per 100ml
Blood 80 milligrammes per 100ml 50 milligrammes per 100ml
Urine 107 milligrammes per 100ml 67 milligrammes per 100ml

The gov.uk drink drive limit page lists Northern Ireland at the same figures as England and Wales and says it is impossible to say how many drinks equal the limit, because it varies with weight, age, sex, metabolism, the drink, food and stress.

Is the limit changing?

The Department for Transport consulted from 7 January to 11 May 2026 on proposed changes to penalties for motoring offences, including a lower drink-drive limit for England and Wales and a lower limit for novice drivers. A consultation is not law. On 30 October 2026, s.11 was unchanged. Learn 35, 80 and 107 for the 2027 exam.

Key fact: The legal limits are in the Act, not in guidance: 35 (breath), 80 (blood), 107 (urine). Scotland: 22, 50, 67.

The offences in full: sections 4, 5 and 5A

Section 5(1) of the Road Traffic Act 1988 reads:

"If a person (a) drives or attempts to drive a motor vehicle on a road or other public place, or (b) is in charge of a motor vehicle on a road or other public place, after consuming so much alcohol that the proportion of it in his breath, blood or urine exceeds the prescribed limit he is guilty of an offence."

Offence Section Conduct Vehicle
Unfit through drink or drugs s.4(1) driving or attempting; s.4(2) in charge Ability to drive properly is impaired (s.4(5)) Mechanically propelled vehicle
Excess alcohol s.5(1)(a) driving or attempting; s.5(1)(b) in charge Alcohol above the prescribed limit Motor vehicle
Specified drug above the limit s.5A Specified controlled drug in blood or urine above its limit Motor vehicle
Failing to co-operate with a preliminary test s.6(6) Without reasonable excuse —
Failing to provide an evidential specimen s.7(6) Without reasonable excuse —
Causing death by careless driving when under the influence s.3A Death caused by careless driving while unfit, over the limit or failing to provide Mechanically propelled vehicle

Plain-English breakdown

  • Section 4 does not need a reading. It needs evidence that the person's ability to drive properly was impaired by drink or drugs.
  • Section 5 does not need impairment. It needs a reading above the limit.
  • Section 5A is the drug equivalent of s.5: a blood or urine level above the specified limit, whether or not driving was affected.

Points to prove for excess alcohol (s.5)

Element What it means Evidence the officer gathers
Drove, attempted to drive, or was in charge Control of the vehicle; or responsible for it at the time Officer's observations, witnesses, keys, position in vehicle
Motor vehicle A mechanically propelled vehicle intended or adapted for use on roads Description of the vehicle
Road or other public place Includes places such as car parks open to the public Location, public access
Consumed alcohol Alcohol in the body Admission, smell, preliminary test result
Proportion over the prescribed limit Evidential breath, blood or urine reading above 35, 80 or 107 Evidential device printout or laboratory analysis; lower of two breath readings used (s.8(1))

Mode of trial and maximum penalty

All the drink and drug driving offences below are summary only, except s.3A, which is indictable only. Penalties come from Schedule 2 to the Road Traffic Offenders Act 1988.

Offence Maximum Disqualification Endorsement points
s.4(1) unfit, drive or attempt 6 months, level 5 (unlimited) fine or both Obligatory 3–11
s.4(2) unfit, in charge 3 months, level 4 fine or both Discretionary 10
s.5(1)(a) excess alcohol, drive or attempt 6 months, level 5 (unlimited) fine or both Obligatory 3–11
s.5(1)(b) excess alcohol, in charge 3 months, level 4 fine or both Discretionary 10
s.5A specified drug, drive or attempt Imprisonment (gov.uk: up to 6 months), level 5 fine or both Obligatory 3–11
s.5A specified drug, in charge Imprisonment, level 4 fine or both Discretionary 10
s.6 fail preliminary test Level 3 fine Discretionary 4
s.7 fail to provide (driving or attempting) 6 months, level 5 fine or both Obligatory 3–11
s.7 fail to provide (any other case) 3 months, level 4 fine or both Discretionary 10
s.3A causing death by careless driving under the influence Life imprisonment, a fine or both Obligatory 3–11

The obligatory ban is at least 12 months, rising to at least 3 years for a second relevant conviction within 10 years, according to gov.uk's drink-driving penalties page and the Sentencing Council guideline. The court may offer a drink-drive rehabilitation course to reduce a ban of 12 months or more.

Sentencing guideline bands

The Sentencing Council excess alcohol guideline sets starting points by reading. In breath terms: 36–59 microgrammes starts at a Band C fine and a 12–16 month ban; 60–89 at a Band C fine and 17–22 months; 90–119 at a medium level community order and 23–28 months; 120–150 and above at 12 weeks' custody and 29–36 months.

Exam tip: "Drive or attempt" means obligatory disqualification. "In charge" means 10 points or a discretionary ban. The same split applies to failing to provide a specimen.

Drug driving limits

The Drug Driving (Specified Limits) (England and Wales) Regulations 2014, as amended, specify limits in microgrammes per litre of blood:

Drug Limit (µg/L blood) Drug Limit (µg/L blood)
Delta-9-THC (cannabis) 2 Amphetamine 250
Cocaine 10 Clonazepam 50
Benzoylecgonine 50 Diazepam 550
Ketamine 20 Flunitrazepam 300
LSD 1 Lorazepam 100
Methylamphetamine 10 Methadone 500
MDMA 10 Morphine 80
6-Monoacetylmorphine (heroin) 5 Oxazepam 300
Temazepam 1,000

Section 5A(3) gives a defence where the drug was prescribed or supplied for medical or dental purposes and taken in line with the directions and the manufacturer's instructions. Once evidence raises it, the prosecution must disprove it beyond reasonable doubt (s.5A(5)). The defence is lost if the person ignored advice about how long to wait before driving (s.5A(4)).

Key definitions and leading cases

  • "In charge" defence. For s.4(2), s.5(1)(b) and s.5A in charge, the defendant can prove there was no likelihood of their driving while still unfit or over the limit. The court may disregard any injury to them and any damage to the vehicle (ss.4(3)–(4), 5(2)–(3)).
  • Unfit (s.4(5)): ability to drive properly is for the time being impaired.
  • Drug (s.11): includes any intoxicant other than alcohol.
  • Fail (s.11): includes refuse. A person does not co-operate with a preliminary test or provide a breath specimen unless it is sufficient and provided in a way that allows the test or analysis to work (s.11(3)).

Leading cases

  • Sheldrake v DPP [2004]: the House of Lords held that the s.5(2) defence places a legal burden on the defendant to prove, on the balance of probabilities, that there was no likelihood of driving, and that this is compatible with the presumption of innocence.
  • DPP v Watkins [1989]: whether a person is "in charge" is a question of fact. Relevant factors include whether they were in the vehicle and where, whether they had the keys, their intentions, and whether someone else was in charge.
  • Cutter v Eagle Star Insurance [1998]: the House of Lords held a car park was not usually a "road". This is one reason drink-drive offences also cover any "other public place".

Police powers: preliminary tests, arrest and entry

Preliminary tests (ss.6 to 6C)

A constable may require a person to co-operate with a preliminary breath test (s.6A), impairment test (s.6B) or drug test of sweat or saliva (s.6C) if they reasonably suspect the person:

  1. is driving, attempting to drive or in charge on a road or other public place with alcohol or a drug in their body (s.6(2));
  2. has done so and still has alcohol or a drug in their body (s.6(3));
  3. is or has been driving, attempting to drive or in charge and has committed a traffic offence while the vehicle was moving (s.6(4)); or
  4. was driving, attempting to drive or in charge at the time of an accident owing to the presence of a motor vehicle on a road or other public place (s.6(5)).

Tests under s.6(2) to (4) can only be given by a constable in uniform (s.6(7)). The accident power in s.6(5) has no uniform requirement.

Arrest and entry

  • s.6D: arrest without warrant where a preliminary breath or drug test leads the constable to suspect the person is over the limit, or where they fail to co-operate and the constable suspects alcohol or a drug in their body. No arrest while they are at hospital as a patient (s.6D(3)).
  • s.6E: power to enter any place, using reasonable force, to require a preliminary test or arrest after an accident in which the constable reasonably suspects someone was injured.
  • s.4(6) and (7): arrest for the s.4 offence on reasonable cause to suspect, and entry by force if need be to make that arrest.

Evidential specimens (s.7)

Evidential breath specimens can be required at a police station, at a hospital, after an accident under s.6(5), or by a constable in uniform (s.7(2)). Blood or urine can only be required at a police station or hospital, and at a station only in the cases set out in s.7(3), for example medical reasons, no reliable device being available, a preliminary drug test indicating a drug, or medical advice that the condition might be due to a drug. PACE Code C paragraph 11.1A confirms that s.7 procedures are not interviews; see our PACE Code C guide.

Key fact: The statutory option to replace a breath reading of up to 50 microgrammes with blood or urine was removed on 10 April 2015 by the Deregulation Act 2015. Now the lower of the two evidential breath readings is used and the other is disregarded (s.8(1)).

Worked exam scenarios

Scenario 1: the plain-clothes officer at the roadside

DC MORGAN, in plain clothes, sees FOSTER drive erratically and smells alcohol when FOSTER stops at lights. MORGAN requires a preliminary breath test.

Answer: The requirement is invalid. Under s.6(2) to (4) the test may be administered only by a constable in uniform (s.6(7)). MORGAN should call a uniformed colleague. If FOSTER had been involved in an accident, s.6(5) would apply and there would be no uniform requirement.

Scenario 2: asleep in the driver's seat

At 03:00 PC REID finds BAKER asleep in the driver's seat of his car in a supermarket car park, keys in his pocket and the engine off. An evidential breath reading is 58 microgrammes.

Answer: The car park is a public place, so BAKER may be "in charge" under s.5(1)(b), judged on the facts (DPP v Watkins). He can avoid conviction only by proving, on the balance of probabilities, that there was no likelihood of his driving while still over the limit (s.5(2); Sheldrake). If convicted, it is 10 points or a discretionary ban, not an obligatory ban.

Scenario 3: the failed specimen after a collision

PRICE crashes into a wall. She is taken to the station but makes only weak blows into the evidential device, which cannot complete the analysis. She says she tried her best.

Answer: Under s.11(3) a specimen is not provided unless it is enough for the analysis to be carried out. If she has no reasonable excuse, such as a genuine medical reason, she commits an offence under s.7(6). Because the specimen was required to find her alcohol level while driving, the obligatory ban applies.

Common exam traps

  • Figures. 35, 80, 107 in England and Wales; 22, 50, 67 in Scotland.
  • Vehicle wording. Section 4 covers a "mechanically propelled vehicle"; ss.5 and 5A a "motor vehicle".
  • Uniform. Preliminary tests under s.6(2)–(4) need a uniformed constable; s.6(5) accident cases do not.
  • Hospital patients cannot be arrested under s.6D while they are patients.
  • Statutory option no longer exists.
  • In charge = discretionary. Drive or attempt = obligatory ban.
  • Burden of proof. The in-charge defence puts a legal burden on the defendant; the s.5A medical defence puts an evidential burden only.
  • Proposals are not law. The 2026 consultation did not change the limit.

Test yourself

  1. Take the free road policing: driving offences topic quiz, then the road regulation topic quiz.
  2. Sit the free diagnostic to compare road policing with your other areas.
  3. Sit mock 1 under timed conditions. The police sergeant exam questions page shows how scenario questions are built.

See the sergeants' exam guide for how road policing sits within general police duties.

10 free road policing: driving offences practice questions with answers

Try each one, then open the answer. For a timed experience use the free topic quiz.

  1. 1. BELL drives through a large puddle beside a bus stop at a speed that is safe for the conditions, deliberately drenching the people waiting there. Which offence is most appropriate?

    1. A. Dangerous driving under s.2, because deliberately soaking the pedestrians fell far below the standard of a competent and careful driver.
    2. B. No offence, because his speed was safe for the conditions and none of the pedestrians was put in danger of injury.
    3. C. Driving without reasonable consideration under s.3, because other persons using the road were inconvenienced by his driving.
    4. D. Driving without due care and attention under s.3, because his driving fell far below the standard of a competent and careful driver.
    Show answer

    C. Driving without reasonable consideration under s.3, because other persons using the road were inconvenienced by his driving.

    Section 3 creates two forms of the offence: without due care and attention, and without reasonable consideration for other persons. Section 3ZA(4) provides that a person drives without reasonable consideration only if other persons are inconvenienced by the driving. Deliberately drenching people at a bus stop is the classic example of inconsiderate driving.

    Source: Road Traffic Act 1988, ss.3 and 3ZA

  2. 2. ORTON glances at his satnav, drifts across the centre line and hits an oncoming motorcyclist, who dies. His driving fell below, but not far below, the standard of a competent and careful driver. Which offence is most appropriate?

    1. A. Causing death by driving: unlicensed or uninsured drivers under s.3ZB.
    2. B. Careless driving under s.3 only, because death is not an element of any careless driving offence.
    3. C. Causing death by careless, or inconsiderate, driving under s.2B.
    4. D. Causing death by dangerous driving under s.1.
    Show answer

    C. Causing death by careless, or inconsiderate, driving under s.2B.

    Section 2B applies where a person causes the death of another by driving a mechanically propelled vehicle on a road or other public place without due care and attention, or without reasonable consideration for other road users. Driving that falls below, but not far below, the standard is careless (s.3ZA), so s.2B rather than s.1 applies.

    Source: Road Traffic Act 1988, s.2B

  3. 3. What are the prescribed alcohol limits for the purposes of ss.3A to 10 of the Road Traffic Act 1988, as they apply in England and Wales?

    1. A. 35 microgrammes per 100 ml of breath, 80 milligrammes per 100 ml of blood, and 107 milligrammes per 100 ml of urine.
    2. B. 50 microgrammes per 100 ml of breath, 100 milligrammes per 100 ml of blood, and 107 milligrammes per 100 ml of urine.
    3. C. 35 microgrammes per 100 ml of breath, 107 milligrammes per 100 ml of blood, and 80 milligrammes per 100 ml of urine.
    4. D. 22 microgrammes per 100 ml of breath, 50 milligrammes per 100 ml of blood, and 67 milligrammes per 100 ml of urine.
    Show answer

    A. 35 microgrammes per 100 ml of breath, 80 milligrammes per 100 ml of blood, and 107 milligrammes per 100 ml of urine.

    Section 11(2) defines 'the prescribed limit' as 35 microgrammes of alcohol in 100 millilitres of breath, 80 milligrammes in 100 millilitres of blood, or 107 milligrammes in 100 millilitres of urine. Regulations may prescribe other proportions, and lower limits apply in Scotland.

    Source: Road Traffic Act 1988, s.11(2)

  4. 4. Which of the following is correct regarding causing death by dangerous driving under s.1 of the Road Traffic Act 1988?

    1. A. It applies only where the driver was also over the prescribed alcohol limit or unfit through drink or drugs.
    2. B. It requires proof that the driver foresaw that his driving might cause death or serious injury to another person.
    3. C. It covers causing another's death by driving a mechanically propelled vehicle dangerously on a road or other public place.
    4. D. It applies only to motor vehicles driven on a road, so driving an off-road vehicle in a public car park is not covered.
    Show answer

    C. It covers causing another's death by driving a mechanically propelled vehicle dangerously on a road or other public place.

    Section 1 provides that a person who causes the death of another by driving a mechanically propelled vehicle dangerously on a road or other public place is guilty of an offence. Dangerous driving is defined objectively by s.2A. No intent to kill or injure is needed.

    Source: Road Traffic Act 1988, s.1

  5. 5. KNOWLES hits a stray dog on a road and drives on. The dog is injured. Which is correct?

    1. A. No duties arise, because only injury to a person or damage to a vehicle or roadside property counts.
    2. B. Duties arise only if the dog dies or is so badly injured that it has to be destroyed.
    3. C. No duties arise, because the dog was a stray and there was no owner present to require his details.
    4. D. The s.170 duties apply, because a dog is an 'animal' for the purposes of the section.
    Show answer

    D. The s.170 duties apply, because a dog is an 'animal' for the purposes of the section.

    Section 170(1)(b)(ii) applies where damage is caused to an animal other than one in or on the driver's vehicle or trailer. Section 170(8) defines 'animal' as a horse, cattle, ass, mule, sheep, pig, goat or dog. KNOWLES should have stopped and, if he did not give his details, reported the accident.

    Source: Road Traffic Act 1988, s.170(1) and (8)

  6. 6. IRWIN, a learner driver on her third lesson, misjudges a junction and pulls out in front of a car, causing it to brake sharply. Against what standard is her driving judged for careless driving?

    1. A. The standard of a competent and careful driving instructor, because she was driving under instruction.
    2. B. The standard of a competent and careful driver, which is not lowered because she is an inexperienced learner.
    3. C. The standard of a reasonable learner driver of similar experience who is being supervised by an instructor.
    4. D. None, because a learner driving under supervision cannot commit careless driving; liability falls on the supervisor.
    Show answer

    B. The standard of a competent and careful driver, which is not lowered because she is an inexperienced learner.

    Section 3ZA(2) provides that a person drives without due care and attention if the way they drive falls below what would be expected of a competent and careful driver. The standard is objective and the same for everyone. A learner is not judged by a lower standard because of inexperience.

    Source: Road Traffic Act 1988, s.3ZA(2)

  7. 7. Which of the following is correct regarding a preliminary drug test under s.6C of the Road Traffic Act 1988?

    1. A. It uses a specimen of urine, and it may be administered only at a police station or a hospital.
    2. B. It uses a specimen of blood taken by a doctor, and only one test may be administered on each occasion.
    3. C. It uses a specimen of sweat or saliva, and up to three preliminary drug tests may be administered.
    4. D. It uses a specimen of breath analysed by an approved device, and up to two tests may be administered.
    Show answer

    C. It uses a specimen of sweat or saliva, and up to three preliminary drug tests may be administered.

    Section 6C(1) describes a preliminary drug test as a procedure in which a specimen of sweat or saliva is obtained and analysed by an approved device. It indicates whether the person has a drug in their body and whether a specified controlled drug is likely to be over its specified limit. Section 6C(3) allows up to three tests, and s.6C(2) allows them at or near the place of the requirement or at a specified police station.

    Source: Road Traffic Act 1988, s.6C

  8. 8. Under s.2A of the Road Traffic Act 1988 (for an ordinary driver), when is a person regarded as driving dangerously?

    1. A. When his driving falls far below the standard of a competent and careful driver, and it would be obvious to such a driver that it was dangerous.
    2. B. When he drives in a way that he personally realises is dangerous, judged by his own experience and knowledge of the road.
    3. C. When the way he drives falls below what would be expected of a competent and careful driver, and such a driver would have seen a risk of harm.
    4. D. When the way he drives causes a collision in which another road user or a pedestrian suffers an injury, however minor.
    Show answer

    A. When his driving falls far below the standard of a competent and careful driver, and it would be obvious to such a driver that it was dangerous.

    Section 2A(1) contains two limbs. The driving must fall far below what would be expected of a competent and careful driver, and it must be obvious to a competent and careful driver that driving in that way would be dangerous. 'Dangerous' refers to danger of injury to any person or serious damage to property (s.2A(3)). The test is objective.

    Source: Road Traffic Act 1988, s.2A

  9. 9. In which of the following situations does s.170 of the Road Traffic Act 1988 (duty to stop and give information) apply?

    1. A. Owing to the presence of a car on a road, a pedestrian is injured.
    2. B. A driver crashes into a tree on private land that is neither a road nor a public place, injuring only himself.
    3. C. A car hits and kills a cat on a road, and there is no other damage.
    4. D. A driver damages only his own car by hitting a kerb.
    Show answer

    A. Owing to the presence of a car on a road, a pedestrian is injured.

    Section 170(1) applies where, owing to the presence of a mechanically propelled vehicle on a road or other public place, an accident occurs causing personal injury to a person other than its driver. It also applies to damage to another vehicle, to a listed animal (horse, cattle, ass, mule, sheep, pig, goat or dog) not in or on the vehicle, or to property fixed to or forming part of the land on which the road or place is situated or adjacent land.

    Source: Road Traffic Act 1988, s.170

  10. 10. ZANE provides two specimens of breath for analysis under s.7. The readings are 52 and 48 microgrammes of alcohol in 100 ml of breath. Which reading is used?

    1. A. 52, because the higher reading is used, provided both readings were taken within five minutes of each other.
    2. B. Neither, because readings that differ by more than 3 microgrammes mean a blood specimen must be required.
    3. C. 50, because the two readings are averaged, and the average is compared with the prescribed limit.
    4. D. 48, because the specimen with the lower proportion of alcohol is used and the other disregarded.
    Show answer

    D. 48, because the specimen with the lower proportion of alcohol is used and the other disregarded.

    Section 8(1) provides that, of any two specimens of breath provided under s.7, the one with the lower proportion of alcohol in the breath is used and the other is disregarded. The statutory option to replace a breath specimen with blood or urine has been repealed.

    Source: Road Traffic Act 1988, s.8

Frequently asked questions

+What is the drink drive limit in the UK?

In England and Wales the prescribed limit is 35 microgrammes of alcohol in 100ml of breath, 80mg in 100ml of blood or 107mg in 100ml of urine. In Scotland it is 22 microgrammes in breath, 50mg in blood and 67mg in urine. gov.uk lists Northern Ireland at the same figures as England and Wales.

+How many drinks can I have and still drive?

There is no safe number. gov.uk says it is impossible to say how many drinks equal the limit, because it depends on your weight, age, sex, metabolism, the type and amount of alcohol, what you have eaten and your stress levels. The only way to be sure is not to drink before driving.

+What is the penalty for drink driving?

Driving or attempting to drive over the limit is summary only, with up to 6 months' imprisonment, an unlimited fine and an obligatory disqualification of at least 12 months (at least 3 years for a second relevant conviction within 10 years). Being in charge over the limit carries up to 3 months, a level 4 fine and 10 penalty points or a discretionary ban.

+Is the drink drive limit in England going to be lowered?

The Department for Transport consulted from 7 January to 11 May 2026 on proposed changes to motoring penalties, including lowering the drink-drive limit and a lower limit for novice drivers. On 30 October 2026 the limit in s.11 of the Road Traffic Act 1988 was unchanged at 35, 80 and 107.

+What are the drug driving limits?

The Drug Driving (Specified Limits) (England and Wales) Regulations 2014 set limits in microgrammes per litre of blood for 17 drugs, including 2 for cannabis (THC), 10 for cocaine, 50 for benzoylecgonine, 20 for ketamine, 10 for MDMA and 250 for amphetamine. Prescribed medicines taken as directed have a statutory defence.

+Can you be done for drink driving if you are asleep in your car?

Possibly. Being in charge of a motor vehicle on a road or other public place while over the limit is an offence under s.5(1)(b). It is a defence for the person to prove there was no likelihood of their driving while still over the limit (s.5(2)). Whether someone was in charge depends on the facts.

+What happens if you refuse a breath test?

Failing without reasonable excuse to co-operate with a roadside preliminary test is an offence under s.6(6), and the person can be arrested (s.6D(2)). Failing to provide an evidential specimen under s.7 is a separate offence; where the specimen was needed to check alcohol while driving, it carries the same penalties as drink driving, including a minimum 12-month ban.

+Do you still get a blood test if your breath reading is borderline?

Not as of right. The statutory option, which let a person with a breath reading up to 50 microgrammes ask for blood or urine instead, was removed on 10 April 2015 by the Deregulation Act 2015. The lower of the two evidential breath readings is used (s.8(1)).

Revision aid, not legal advice. The College of Policing exams follow the 2027 Blackstone's Police Manuals, so check every point against your manual and the current law on legislation.gov.uk. Police Sergeant Exam is independent and not affiliated with the College of Policing, the Home Office or Oxford University Press.

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