Breath Sample Demand
As part of the offence of "Over 80" under s. 253(1)(b), the crown must prove the accused's Blood Alcohol Content (BAC) is over 0.08 per millilitres.
Under s. 254(3), a sample of breath, urine or blood can be taken for measurement. The sample can be analysed and a blood alcohol level can be measured. This measurement can be used to infer the BAC level at the time that the accused was operating a motor vehicle.
The procedure required for a proper demand under s. 254(3) must be followed. The taking of a sample counts as a search and if the procedure is not followed then it will amount to a search not authorized by law, and therefore violate s. 8 of the Charter. Section 254(3) sets the constitutional minimum requirement for a search.
The timing of the sample is of great importance. The timing must be in relation to the time in which the accused was in care and control of the vehicle and in relation to the time where the officer initially forms grounds of suspicion and belief.
Most details of the demand, such as who asked for the demand or where it was made, are not essential to prove. There only needs to be evidence that the demand was made with sufficient grounds as soon as practicable.
Under s. 254(3), a peace officer may demand an Intoxilyzer breath sample where the officer has “reasonable and probable grounds” to believe that the person is committing, or has committed in the last three hours, an impaired driving offence.
Samples of breath or blood
(3) If a peace officer has reasonable grounds to believe that a person is committing, or at any time within the preceding three hours has committed, an offence under section 253 as a result of the consumption of alcohol, the peace officer may, by demand made as soon as practicable, require the person
- (a) to provide, as soon as practicable,
- (i) samples of breath that, in a qualified technician’s opinion, will enable a proper analysis to be made to determine the concentration, if any, of alcohol in the person’s blood, or
- (ii) ...; and
- (b) if necessary, to accompany the peace officer for that purpose.
R.S., 1985, c. C-46, s. 254; R.S., 1985, c. 27 (1st Supp.), s. 36, c. 1 (4th Supp.), ss. 14, 18(F), c. 32 (4th Supp.), s. 60; 1999, c. 32, s. 2(Preamble); 2008, c. 6, s. 19.
"Reasonable grounds to believe"
Blood or Breath Sample Demand
The demand informs the accused of the intention to take a sample of blood or breath. A typical sample demand under s. 254(3) will go as follows:
- "I demand you to accompany me to <location of breathalyser > and to provide samples of your breath, suitable to enable an analysis to be made in order to determine the concentration, if any, of alcohol in your blood. Should you refuse this demand, you will be charged with the offence of refusal.
- Do you understand?"
Blood Sample Demand
- "I demand you to accompany me to <location> and to provide such samples of your blood, as in the opinion of the qualified medical practitioner or qualified technician taking the samples, are necessary to determine the concentration, if any, of alcohol in your blood. Should you refuse this demand, you will be charged with the offence of refusal.
- Blood samples will only be taken by or under the direction of a qualified medical practitioner and if the qualified medical practitioner is satisfied that the taking of the samples will not endanger your life or health.
- Do you understand?"
The demand must be in plain language, sufficient for the accused understand what is required of them.  There is no fixed formula or magic wording, rather sufficiency can be inferred on the surrounding circumstances of the demand. 
A variety of variations on demand are available.
The key requirement is that the demand not be a invitation or request. It must be unequivocal. 
There is no requirement that the word "forthwith" be used, but the meaning must be conveyed by word or conduct.
It is not more restrictive or meaningful to say "sample" instead of "samples".
Whether the demand was unequivocal is a question of fact.
The demand should always involve an advisement that the sample will be taken by a qualified practitioner.  However, it is not necessary to inform the accused of all requirements regarding qualified medical practitioners.
A Breathalizer demand can be made at any location and need not be at the location of the approved machine.
The officer should take steps to ensure that the accused understands the questions of the demand and is able to respond in a meaningful way.
The validity or invalidity of a second demand made by the Qualified Technician does not affect the validity or invalidity of the initial demand of the investigating officer and vice versa.
It is generally sufficient evidence for the officer to give testimony that a "breath demand" was made without giving a full verbatim reading of what was said.
- R v Harasym, 2008 ABQB 649 (CanLII) at para 30
R v Nicholson (1970) 8 CCC (2d) 170 (NSCA)(*no link) - no special words are needed, only must be clear that there is no choice
R v Flegel (1972) 7 CCC (2d) 55 (SKCA) (*no link)
R v Boucher (1986) 47 MVR 173 (SKCA)(*no link)
R v Langdon 1992 CanLII 2776 (NL CA), (1992), 74 CCC (3d) 570, 16 W.C.B. (2d) 571 (Nfld. C.A.)
R v Phelan 1997 CanLII 14611 (NL CA), (1997), 151 Nfld. & P.E.I.R. 169, 35 W.C.B. (2d) 175 (Nfld. C.A.) at paras 12 and 13
R v Truscott, 2009 BCSC 364 (CanLII), at paras 19 and 20
R v Ghebretatiyos (2000), 8 M.V.R. (4th) 132, 48 W.C.B. (2d) 365 (Ont. Sup. Ct. J.)(*no link) at para 19
A.-G. Alta v Kozicky, (1972), 9 CCC (2d) 146(*no link) at p. 149,  6 W.W.R. 623 at p. 626
R v Rentoul (1977), 37 CCC (2d) 78 (Alta. S.C.T.D.)(*no link) per MacDonald J. at p. 83
R v Showell, 1971 CanLII 512 (ON SC), (1971), 4 CCC (2d) 252 at p. 255,  3 O.R. 460, 15 C.R.N.S. 305 at p. 308(“For a demand to be made pursuant to s. 223(1) [now s. 235(1)] it is sufficient merely for the officer to say he is asking for a breath sample pursuant thereto.”)
e.g. R v Bourns,  O.J. No. 2687 (Ont. Gen. Div.) (*no link)
R v McKeen, 2001 NSCA 14 (CanLII), (2001), 151 CCC (3d) 449 (NSCA)
R v Dotremont, 2011 MBQB 88 (CanLII), (2011), 12 M.V.R. (6th) 239 (Man. Q.B.)
R v Boucher (1986), 47 M.V.R. 173 (N.B.Q.B.)(*no link) at p. 176
R v Nicholson - no special words are needed, only must be clear that there is no choice
- R v Torsney, 2006 CanLII 18732 (ON SC),  OJ 2228 (ONSC)
- R v Rentoul (1977) 37 CCC (2d) 78 (ABQB) (*no link)
R v Barwick, 2009 QCCA 458 (CanLII),  QJ 1876 (QCCA)
- R v Jackson 2005 ABQB 268 (CanLII) at para 47
- R v Barrett, 2012 NLCA 12 (CanLII),  NJ 61 (CA)
- R v Kitchemonia, 1973 CanLII 888 (SK CA),  5 W.W.R. 669 (SKCA)
- R v Squires 2002 CanLII 44982 (ONCA) at para 32
- R v Townsend, 2007 ONCA 332 (CanLII),  OJ 1686 (CA)
R v Stewart, 2009 CanLII 11 (ON SC),  OJ 11
R v Benson,  OJ 3056 (ONSC)(*no link)
R v Tash, 2008 CanLII 1541 (ON SC),  OJ 200
R v Antoniak, 2007 CanLII 53233 (ON SC),  OJ 4816
Timing of demand ("as soon as practicable")
A breath demand amounts to a warrantless search and so is prima facie unreasonable, thus the burden is on the Crown to establish the validity.
Under s. 254(3), "as soon as practicable" means "within a reasonably prompt time" given the circumstances.
When delays exist due to the offs are performing other duties, the question for the judge is not simply weather there exists "some explanation" but rather weather "the steps taken by the office or in performing general duties before the demand was made were necessary and reasonable in the circumstances".
Where the investigating officer failed to make a valid demand, the qualified technician can still make a valid breath demand. The qualified technician must have the same requisite grounds and must make the demand "as soon as practicable" upon getting the grounds.
Waiting for a tow truck may result in too much delay. It is incumbent upon the officer to keep up to date on the availability of a tow truck and consider options such as calling for assistance in the case of a delay in its arrival.
- R v Breland, 2011 SKPC 54 (CanLII) at 22
R v Squires, 2002 CanLII 44982 (ON CA), (2002), 59 O.R. (3d) 765 (C.A.)
R v Phillips 1988 CanLII 198 (ON CA), (1988), 42 CCC (3d) 150 (Ont. C.A.) at 156
- R v Vanderbruggen 2006 CanLII 9039 (ON CA), (2006), 206 CCC (3d) 489 (Ont. C.A.) at para 12 and 13 (the “touchstone for determining whether the tests were taken as soon as practicable is whether the police acted reasonably”)
See R v Letford, 2000 CanLII 17024 (ON CA), (2000), 150 CCC (3d) 225 (Ont. C.A.) at para 20
R v Seed, 1998 CanLII 5146 (ON CA),  O.J. No. 4362 (C.A.) at para 7
R v Cambrin 1982 CanLII 353 (BC CA), (1982), 1 CCC (3d) 59 (BCCA) at 61-3
R v Carter, 1981 CanLII 2063 (SK CA), (1981), 59 CCC (2d) 450 (Sask. C.A.)
- R v Memisevic, 2010 BCSC 203 (CanLII)
R v Chilton,  OJ 3655 (SC) (*no link)
R v Gill, 2007 CanLII 44826 (ON SC),  OJ 4098 at paras 37 to 40
R v Dhaliwal, 2005 CanLII 8716 (ON SC),  OJ 1129 at paras 23 to 26
e.g. R v Dion, 2010 SKPC 76 (CanLII), 32 min wait for tow truck too long
R v McGonigal, 2011 ABPC 183 (CanLII), - judge suggests that officer failed to keep track of delays in tow truck. violation found for 45 min delay.
R v Johnson, 2008 ABPC 225 (CanLII), - 27 min delay was acceptable. Officer believed assistance not available that evening
R v Budgell, 2007 ABPC 138 (CanLII), (2007), 424 A.R. 313, 25 min wait for truck unreasonable where officer did not checking if other officers could help