Previously the police could only charge a driver on the basis that their driving was impaired because of a drug. In order to secure a conviction at court, they had to prove not only that the driver had a controlled drug in their system but also that the individual was impaired to drive as a consequence of that drug. They would adduce evidence on the physical condition of the driver and any bad driving, poor performance in field impairment tests and blood results demonstrating presence of the drug. They would also have to show that a police doctor had found that the impaired condition of the driver may be due to a drug. As you can imagine, there are many avenues to defend against this charge and we have found the acquittal rate to be high.