One of the problems with medical marijuana, at least from cops' perspective, is that pot is hard to detect in the field, and many drivers could be getting away with DUI because they're high but not drunk. Nearly one-third of fatal California crashes involve drugged drivers.
The problem inspired one California legislator to propose a law that would trigger a DUI case for anyone whose blood test shows even a trace of cannabis in their system. That could be problematic if you're a medical patient who toked yesterday but was stopped by police today. Even worse: A pot breathalyzer might be on the horizon. LA Weekly has more.