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III. Driving under the influence

Chapter 5: Driving

Where can you be checked?

You can be subject to inspection in a public place. These are places accessible to the public, private or not , such as paid parking, the parking lot of a nightclub, and of course public roads. 

What can you be subject to inspection for?


State in which a person finds himself who no longer has permanent control of his actions without necessarily having lost consciousness of them following the consumption of alcohol, drugs or medication.

  • Apparent condition 
  • State of euphoria  and excitement
  • Disinhibition which can lead to taking risks
  • Poor assessment of situations
  • Loss of motor coordination
  • Reaction time is longer
  • Temporary 12-hour driving ban 

Les médicaments

Certains médicaments ont pour conséquences

  • la somnolence, et diminuent les réflexes.
  • réduisent les capacités de jugement
  • rendent euphorique et agressif 
  • troubles de la vue ou de la coordination
  • vertiges
  • Interdiction temporaire de conduire de 12 heures 


  • Some medications cause

    • drowsiness , and reduce reflexes.
    • reduce judgment skills
    • make you euphoric and aggressive 
    • vision or coordination problems
    • dizziness
    • Temporary 12-hour driving ban 

What are the steps of the procedure?

1. Standardized checklist

  • The officer checks, using a checklist, whether the driver shows physical signs of drug use.
  • After a general observation the agent may decide to do a saliva test. 

2. Saliva test:

  • The trained officer takes a saliva sample from the driver
  • If the device reveals the presence of drugs in the saliva, a saliva test or blood test will be necessary .
  • Temporary driving ban for 12 hours.

3. Saliva or blood analysis

  • In the event that the saliva test indicates a positive result for the targeted substances, the qualified agent will carry out a saliva or blood analysis.
  • The analysis confirms the result, the driver can request a new analysis.
  • If the result of the second opinion is positive, there will be legal action.

Alcoholic impregnation

It is the alcohol level in exhaled alveolar air or in the blood . Alveolar air is the air contained in the pulmonary alveoli and the only one in contact with the blood.


Who can give you a breath test?

  • He is a qualified agent

Where can he do it?

  • In a public place in general. This involves public roads, public or private parking , such as paid parking, the parking of a nightclub, a supermarket, campsite, etc.)

Who can it be imposed on?

  • To the driver of a vehicle or an animal
  • To a person who guides with a view to learning (driving school instructor or guide)
  • To a person involved in an accident (suspected perpetrator or victim)
  • To a person who is about to drive a vehicle or animal.
  • Not to a person sleeping in their car.

Before blowing, you can ask for 15 minutes no more for the 2nd analysis .

The breath test

Result in the form of SAP letters

  • Safe = OK
  • A lert = Positive 1st degree
  • P ositive = Positive 2nd degree
  • If result or P we will proceed to the breath analysis

Breath analysis:

Is done with a breathalyzer , which gives a numerical and precise result and prints it.

If the alcohol level in the exhaled alveolar air is

  • Less than 0.22 milligrams/liter of exhaled alveolar air (mg/l AAE) you are negative.
  • Reaches 0.22 mg/l without reaching 0.35 mg/l of AAE 3-hour driving license ban.
  • Reaches 0.35 mg/l AAE or more driving license ban for 6 hours.

For drivers of paid vehicles

If the result reaches 0.09 mg/l of AAE, driving license ban for 2 hours.

Blood test

The blood sample will be taken from any person:

  • Who requests it for second opinion. This will be done at his expense.
  • Who has an exemption for medical reasons (e.g. an asthmatic).
  • Involved in a driving accident and unable to breathe.
  • Who’s so drunk she can’t breathe.

If the blood alcohol level is:

  • Less than 0.5 grams/liter of blood you are negative and can leave
  • Reaches 0.5 grams of alcohol/liter of blood without reaching 0.8 Temporary driving ban for 3 hours.
  • Reaches 0.8 grams of alcohol/liter of blood or more Temporary driving ban for 6 hours.
  • For people who drive transport vehicles paid from 0.2 grams of alcohol/liter of blood Temporary driving ban for 2 hours.

The blood test cannot be done on a person who is about to drive.

  • The person who refuses to blow will be temporarily banned from driving for 6 hours.
  • The person who has a 6-hour driving ban and who has not been able to be accompanied will have to take another breath before getting behind the wheel.
  • The person who is prohibited from driving can leave but as a passenger but leaves their driving license with the qualified agent.

When we talk about a glass of alcohol, we refer to a dose served as in a bar which is equivalent to  10 grams of pure alcohol in a glass.

Therefore, in a glass of beer the concentration of alcohol is the same as in a glass of wine or a glass of whiskey.

In theory, having two glasses of alcohol is fine, but a third drink would put you in a situation of punishable alcoholic impregnation.

It takes two hours to wait so that the alcohol content of the extra glass can dissipate in the body.

The glass of alcohol adds:

  • 0.3 g  in the blood and we lose 0.15 g in one hour.
  • 0.14 mg in the breath and we lose 0.07 mg in one hour.

Example: I have 4 glasses of alcohol and I have to wait 4 hours before driving again.

What are the possible penalties?

Depending on the case, the consequences may be:

  • Fine
  • Immediate withdrawal
  • Forfeiture
  • A prison sentence
  • The obligation to install an immobilizer in your vehicle.

I test my knowledge with questions

Chapitre 1: La réglementation