The accused was charged with impaired driving by drug on October 20, 2013, in Milton, Ontario, contrary to section 253(1)(a) of the Criminal Code.
The Crown proceeded summarily.
The accused admitted to being prescribed methadone since 2011 or 2012 and was using this drug at the time of the offence.
Two civilian witnesses observed the accused's vehicle exhibiting extremely erratic and dangerous driving patterns for approximately 10 to 15 minutes, including running red lights, mounting curbs, swerving abruptly, and driving into oncoming traffic.
Police located the accused shortly thereafter under her vehicle attempting to replace a flat tire.
A Standard Field Sobriety Test was conducted, followed by a Drug Recognition Evaluation, which concluded the accused was impaired by a narcotic analgesic.
A urine sample detected methadone, diazepam, nordiazepam, oxazepam, temazepam, carboxytetrahydrocannabinol, and mirtazapine.
The accused testified that her impairment was attributable to sleep deprivation, assault by her boyfriend earlier that day, and side effects of prescribed medications.
The defence called Dr. David Rosenbloom to provide alternative explanations for the signs of impairment.
The court rejected the accused's testimony as unreliable and found the defence expert's evidence to be biased and of no weight.
The court convicted the accused based on the totality of the evidence, including the dangerous driving observations, the DRE evaluation, and the medical evidence.