Determining whether a driver has been impaired by alcohol is usually a straightforward matter. By administering a breath test, a police officer can tell with some certainty if an individual has a blood alcohol level that exceeds the legal limit in Ontario. However, what happens in cases in which impaired driving is believed to be the result of drug use?
Currently, there is no established legal limit in this province for concentrations of the active components of drugs in the blood. Additionally, there is no device to measure such levels, even if a limit did exist. Right now, officers trained as Drug Recognition Evaluators provide the only evidence to the courts when drivers are suspected of being under the influence of drugs.