Expert testimony can be admitted in drugged-driving trials without a preliminary examination of the evidence, the Supreme Court has ruled. The decision could simplify the complicated process of trying accused stoned drivers.

Legal pot means more pot, which means more stoned drivers. Here are two decisions lawmakers will have to make about how to handle marijuana-impaired driving.

Our system for prosecuting drug-impaired drivers is far more complicated than for drunk ones. Here's why an Ottawa case, along with the coming legalization of pot, may force a simpler system,