Principles of Impaired Driving Investigation

Henry Waldock
Last updated: 2022-01-19

Many investigators find impaired driving investigations intimidating.

In British Columbia, many officers take advantage of the simple administrative procedures which work in routine cases.

But not every case is routine.

Confusion arises because key principles conflict. Clarity comes from understanding the principles.

Basic Principles

Conflicting Principles


Principle
Principle

Haste
Drug and alcohol testing sections require you to make and execute demands "immediately" or "as soon as practicable".
You may only make such demands when you have reasonable grounds. Courts require full accounting and documentation to justify the demands that you make. Gathering grounds and documenting your observations takes time.
Accountability
Haste
Detained suspects have the right to get legal advice "without delay", and must be told so, without delay.
Detained suspects have the right to a reasonable opportunity to get legal advice in private from such available lawyers as they may choose. This may take time, especially at difficult times or places.
Diligence
Delay
You must wait until the suspect exercises or waives this right before eliciting evidence from them. Proof beyond a reasonable doubt requires collecting all possible evidence. With impaired drivers, much of that comes from the suspect.
Investigation
Exception
At roadside, you may obtain some evidence from a detained driver, for the purposes of determining whether to make a breath, blood or DRE demand.
If you obtain evidence this way, the trial judge can only use it to determine whether you had grounds to make a demand. The trial judge can not use this evidence to prove guilt.
Exception
Liberty Infringe on the suspect's liberty as little as necessary. Don't arrest if you don't have a reason. Release as soon as it is safe to do so.
Arrests are effective. They control difficult suspects, empower officers to search for evidence, and may mitigate future risks.
Diligence
Voluntariness
Generally, suspects have the right to silence. Don't compel them to create evidence against themselves.
Lawful demands compel suspects to provide evidence against themselves. Make demands properly, conduct the tests properly.
Compulsion
A complete investigation should include an effort to elicit evidence from the suspect.
Diligence
Efficiency
Criminal investigation and prosecution is expensive. Administrative procedures are cheap. For some people they are effective.
Impaired driving kills Canadians. Repeat offenders and serious cases require full investigation and prosecution.
Public safety
Complexity
When handling complicated investigations, officers who follow the procedure tend to avoid making mistakes.
No procedure can cover every case. Officers who understand and apply the principles do better investigations than those who merely follow procedure.
Completeness


Haste to Make and Execute Demands

The power to demand that a suspect provide breath or bodily samples (or comply with sobriety tests) comes with obligations to:

  1. make the demand quickly, and
  2. execute on the demand quickly.
Screening

If a peace officer has reasonable grounds  to suspect:

Field sobriety tests
320.27(1)(a)
"the peace officer may, by demand, require the person ... to immediately perform the physical coordination tests prescribed by regulation..."
Breath screening
320.27(1)(b) "the peace officer may, by demand, require the person ... to immediately provide the samples of breath [for analysis by] an approved screening device..."
Drug screening
320.27(1)(c) "the peace officer may, by demand, require the person ... to immediately provide the samples of a bodily substance that [can be tested by drug screening equipment"
Mandatory breath screening
320.27(2) [An officer who has an approved screening device in their possesion] may, by demand, require the person who is operating a motor vehicle to immediately provide the samples of breath [for analysis by] an approved screening device..."

Although the legislation does not explicitly say that the officer must make the demand right away upon discovering the grounds for it, the courts interpreted it to include this requirement. Dewald, 92 CCC (3d) 160 (Ont. CA) affirmed Dewald, [1996] 1 SCR 6.

Some courts found that unnecessary delay of just a few minutes rendered the demand unlawful. eg Megahy, 2008 ABCA 207; McCullough, 2007 ABQB 423.

But spending extra time to make sure that your grounds are solid is okay. Nguyen, 2008 BCSC 1082.

Analysis and Evaluation

If a peace officer has reasonable grounds to believe

Breath demand
320.28(1)(a) (i)
"... [driver impaired by alcohol], the peace officer may, by demand made as soon as practicable, require the person to provide, as soon as practicable ... samples of breath [for analysis]..."
Blood demand
320.28(1)(a) (ii)
"[driver impaired by alcohol],  the peace officer may, by demand made as soon as practicable, require the person to provide, as soon as practicable ... [if impractable or incapable of getting breath and doctor okays it] samples of blood [for analysis]..."
DRE demand
320.28(2)(a) "[driver impaired by drugs or drugs and alcohol]  the peace officer may, by demand made as soon as practicable, require the person to submit, as soon as practicable [to a DRE exam].
Blood demand (drugs) 320.28(2)(b) "[driver impaired by drugs or drugs and alcohol]  the peace officer may, by demand made as soon as practicable, require the person to provide, as soon as practicable [to a DRE exam].

Delay making this demand renders it unlawful, unless you were occupied with duties that couldn't wait. Naidu, 2012 BCCA 150. Tending to injured people at the scene is a good reason to delay the demand. Squires, 2002 CanLII 44982 (ON CA). Waiting for a tow truck to arrive to move the suspect's car is not. Whitesell, 1998 CanLII 3082 (BC SC).

Do what must be done at roadside: public safety, police warning, Charter warning, officer safety steps. Obey requirements of Motor Vehicle/Highway legislation. Do other time-consuming steps when time permits: writing up the file etc. Don't wait for tow-trucks to arrive if other officers can manage the scene.

Take steps to prevent delay in the investigation. Before or while driving to the police station, call ahead to ensure that the breath technician or drug recognition expert will attend promptly. Perhaps the defendant wants to reach a specific lawyer. Ask someone to contact that lawyer before you arrive.

Accountability for Suspicion or Belief

To make a breath, saliva, field sobriety test, drug evaluation or blood demand you need reasonable grounds to suspect or believe:

  1. who (driver)
  2. what (driving or care or control)
  3. when (for screening demands operation within the preceding 3 hours.)
  4. how (drugs or alcohol in body or impaired by alcohol or a drug)

What you can demand depends upon how strong the evidence is:

For alcohol impairment, to make a blood analysis demand, you must also believe that the person is "incapable of" giving breath into an instrument, or it would be "impracticable to" get the suspect to an instrument.

When you stop a vehicle, you observe the who, what, and when. But at an accident scene, you must investigate. Try to get the answers to these questions from all possible sources, not just the driver, for example

When you have reasonable grounds to suspect that a driver's body contains alcohol or drug, you may:

Although “reasonable suspicion" that a driver contains alcohol may arise from hearsay, observation, or inference, usually it comes from smelling liquor on the drivers breath. Many judges prefer you to isolate that smell from other possible sources. Removing the driver from the car usually achieves this. Asking the driver may also achieve this - if the driver accedes.

When you have reasonable grounds to believe that alcohol or a drug impairs a driver you may:

To make a demand, you don't need complete proof that the driver is drunk or high, but you need more than a strong odour of liquor. A smell just means the driver drank; the judge needs to know why you thought the drinking impaired the driver's ability to drive.

To survive the cross-examination at trial, you need to be able to list the information you learned, and articulate why this information made you think that the preconditions for the demand were met.

(Your card contains a checklist of the conclusions you must reach. Try reading it to yourself before reading to the suspect.)

Right to Legal Advice

Screening demands under s.320.27 (breath screening, saliva testing, SFST) are "detentions" for the purpose of s.9 and 10 of the Charter. Ordinarily, the suspect has the right to get legal advice. But the need to perform them quickly at roadside, creates an exception to the right to legal advice.  You can use your observations and the results of the test for the purpose of determining whether to make analysis or evaluation demands. This is a narrow exception to the general rule.  The prosecutor can't use the evidence prove the suspect's guilt. Orbanski & Elias, 2005 SCC 37.  Thomsen, [1988] 1 SCR 640

Demands under s.320.28 (breath testing, blood testing, DRE) do engage the right to counsel. Section 10 of the Charter requires you to offer access to counsel "without delay", and deliver it "without delay" if requested.

The trigger occurs at the time of detention. It applies at roadside. Tremblay, 2021 QCCA 24 It applies at the hospital. Taylor, 2014 SCC 50. Private access. Playford, 1987 CanLII 125 (ON CA)

After a demand under s.320.28, do not proceed to the testing before checking if the suspect wants legal advice. If the suspect does, ask no questions about the offence. In this context, the suspect may choose from among lawyers who are reasonably available to give legal advice, but may not use the right to counsel to defeat a proper investigation. In the context of declining blood-alcohol levels, the defendant may choose only those lawyers who are reasonably available. Littleford, 2001 CanLII 8559 (ON CA)

Eliciting, Holding off, and Investigating

A good investigation canvassess all sources of evidence.

Getting evidence from the driver requires special care. The obligation to hold off eliciting evidence from the suspect starts when you detain him or her, and ends when the suspect gets legal advice. Before and after that point, investigate.

The procedure for testing breath provides only evidence of a blood-alcohol level. Only investigation can discover how that alcohol affected the driver's sobriety. Therefore:

Don't question the driver about the offence before the driver exercises or waives the right to counsel. But after the driver addresses legal advice, make a real effort to question the driver and record his or her intoxication.

Keep investigating while you have the driver in your presence.  Even at court when the driver appears for trial observe how does this driver walks and talks when sober (assuming he's sober at court).

I like quantification. Instead of writing “the driver stumbled", try recording “on the 3rd step toward police car, driver's right foot moved 18 inches to right". Instead of writing “unsteady on her feet", try “head rotating clockwise 5 inches diameter".  If the driver slurs words, record the slurring. (“Offisher, I washn't drunking thish evning.")

Interrogating the Intoxicated Suspect

Is it fair to question an intoxicated driver?

Judges may sometimes take exception to officer who takes unfair advantage of a drunk to elicit a confession, because the suspect may not understand what is going on.

But the fact that the suspect was too drunk to understand what was going on tends to prove he was too drunk to drive a car.

It is not wrong to interview a drunk. Mehan, 2017 BCCA 21 But you must ensure that the subject:

If you don't think your suspect meets this standard, video-record your efforts to explain them. Playing that video to the judge will prove intoxication.

Demands and Refusals

When making a demand, never suggest that the suspect has a choice. (“Are you going to blow?") Proceed as if the suspect will blow; give up trying to get breath samples only when the suspect makes it absolutely clear that he or she won't blow.

Refusal is an offence. The suspect's words and actions are the crime. You are the witness.  Document or record as much of this as you can. I like video and audio recordings.

When using a screening device, some officers tell the suspect that the penalties are the same whether the driver refuses or blows a "fail". That's not true. There is no offence of failing a screening device, but in BC, there are administrative consequences for a "fail", just as there are consequences for a refusal.

Police officers used to tell drivers that the penalties for failing the breath analysis are the same as the penalties for refusal. That's not true any more. After December 18, 2018, for first offenders, the fine for refusal is higher than the fine for impaired driving, and depending on whether the Blood-Alcohol Concentration is double the legal or lower, the fine is the same or lower if the suspect blows into the instrument. But the penalties for repeat offenders are the same.

Silence is not a refusal.  When the suspect refuses to speak, or gives ambiguous or contradictory information about whether he or she will blow, bring the suspect to the instrument and try to test their breath.

After a screening demand, the suspect has no right to talk to a lawyer unless you must delay to find a screening device.

After a breath analysis demand, the suspect has the right to talk to a lawyer. Don't accept the refusal unless the suspect waives or consults with counsel and still refuses to blow.

Keep trying to get the suspect to comply with the demand until you have enough evidence to convince even a skeptical judge that the suspect unequivocally refused, or willfully failed to comply with the demand. Don't ask yourself the question "Am I convinced that this guy won't do it?" Ask instead "Will the judge be convinced beyond a reasonable doubt that this suspect intended to commit this crime?" When you ask the question that way, you will realize that notes are good, audio-recordings are better, but video-recordings make the best evidence.

Care or Control

... Is about risk that the suspect will pose to the public by operating the vehicle. Boudreault, 2012 SCC 56  If you find the suspect sitting in the driver's seat, the court may presume that the driver had care or control (s.320.35), unless the driver says he wasn't intending to set the vehicle in motion.  But drunks sometimes change their minds.

Taking Blood

Before taking blood, a medical practitioner must be satisfied that taking a blood sample will not endanger the suspect's health. You must tell the suspect that no blood sample will be taken if it would endanger his or her health. You can make a demand before getting the medical opinion that it would be safe to take the blood.

Fail

A “fail" result on a screen device tells you something about the drivers blood-alcohol level. The screening device does not say the driver is drunk. But your training should tell you that a "fail" occurs when the driver has 100 mg% of alcohol in his or her blood (or whatever other number your screening device is calibrated at).

Therefore, a “fail" means you believe the driver is over 80.

Qualified toxicologists told me that a blood-alcohol level of 100mg% or more impairs everyone. If qualified toxicologists tell you the same thing, then a “fail" gives you grounds to arrest and detain the driver for impaired driving. Please note: I am not a qualified toxicologist. Do not rely on my advice on this point. If toxicologists have not told you the same thing, then you can arrest or detain only for operation with 80+mg%.

Arrest or detain?

Unless the driver injured or killed someone, the offence of impaired driving may be prosecuted summarily or by indictment. For such hybrid offences, s.495 of the Criminal Code prevents you from arresting people when all public interest concerns are met. Never arrest unless you have a reason. But in most cases, there will be a reason.

Equipment & Documentation

Don't trust a screening device until you know it's calibrated. For that reason, your office procedures should document the results of screening device maintenance.

Recent decisions say defence are entitled to just about all documentation concerning breath testing equipment and the technicians who operate it. Keep clear records and make them available for disclosure.

BC Administrative Driving Prohibition

Peace officers must submit sworn documentation to the Superintendent of Motor Vehicles.  Murray v. British Columbia (Superintendent of Motor Vehicles), 2013 BCCA 363

Accident Cases

The same principles of investigating drivers you stopped apply to investigating drivers whose vehicles stopped before you got there. The differences are: you start with less evidence about who was driving and when. Injuries often complicate the crime scene and your investigation.

Who/What

Identifying the driver can be done many ways, but the riskiest way to gather this evidence is by asking the driver to incriminate himself. Try to rely on other ways first:

When

Grounds for a demand may be collected only within the 3 hours following driving. s.320.27 (Curiously, the demand itself may be delivered after this time frame, so long as the officer who makes the demand forms his or her opinion before the 3 hours expired, and makes the demand as soon as practicable.)  Deruelle.

There are many ways to determine the recency of driving. Again, asking the suspect is the riskiest because of the right to silence.  For example:

Police officers often assume that the time of dispatch determines the time of the accident. This is a mistake. Nobody called 911 until after the accident occurred.  Dispatchers then responded after the 911 calls. Unless the 911 callers testify that they called 911 immediately, and the dispatchers testify that they dispatched immediately, the court will near no evidence of the time lapse between accident and dispatch.

How

At the time of driving, was the driver's ability to drive impaired by drugs or alcohol?

After the crash, the suspect may appear unsteady or dim-witted. Is it shock, head injury, or booze? A combination of investigative techniques may shed light on these questions.  For example:

Keep watching the suspect. Changes in symptoms, or the absence of change of symptoms can make a big difference in the case. Saul, 2015 BCCA 149.

Jeopardy

When deciding whether to comply with breath or blood demands, the driver should know how much harm was done. Therefore, to the extent that you know whether other people were injured or killed, you must tell the driver before he or she provides bodily samples, and before he or she gets legal advice.

And if you learn that an injured victim succumbed, you should tell the detained driver about the new development, and permit further access to counsel.

Doctors & Medical Records

Doctors owe their patients a duty of confidentiality. If you go to the hospital, don't ask or permit the doctor to tell you “informally" what blood-alcohol concentrations their lab reports showed.  Dersch, [1993] 3 SCR 768.  Get a search warrant or production order.

Scene of the crime

The crash is where the crime stopped. The route the suspect drove is the scene of the crime. When investigating the crime, photograph the scene of the crime - as much of the route the suspect drove as is relevant to the offence - not just the crash site.


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