A "breath sample" refers to the air that a person exhales, which is used to measure the presence of certain substances, like alcohol, in their body. Full definition
Without having to obtain a warrant the police can demand that you provide breath samples into instruments designed to detect the level of alcohol in your bloodstream. (lslaw.ca)
The public therefore accepts the use of breath samples both for roadside screening and ultimately for the determination of blood alcohol levels. (bestimpaireddefence.ca)
This is a considerably more invasive and time - consuming procedure requiring you to park your car, exit the vehicle and provide a suitable breath sample into a hand - held measurement device. (slaw.ca)