DRUG IMPAIRMENT – THE FACT IS THAT IT CANNOT BE DETERMINED BY THE ALCOHOL MODEL APPROACH WE ARE TAKING – For cannabis, an officer spends six hours processing an impaired driver, compared to one hour for a driver impaired by alcohol. This difference reflects the time required to complete a specialized field sobriety test, to administer a test by a drug recognition expert and take a blood sample. The minimum cost to have one officer deal with a cannabis-impaired driver is $536.88, compared to $89.48 for an alcohol-impaired driver, suggests the report. Those costs don’t include labour for paperwork or court appearances.