When you get THC results back, you are provided with different numbers. One will reflect long term use and will stay in the system for several months. The level of this number will tell you how heavy of a user they are. The other numbers tell you whether the person could have been high at the time. The problem is that the active intoxicant disappears from the test results BEFORE the intoxicating effect goes away.
According to this story:
http://www.nydailynews.com/news/nati...icle-1.2911866 Castile and his girlfriend had smoked before the car stop. To me, the odds are that he was stoned when he interacted with the officer and was shot. Marjijuana is an intoxicant - that's why people use it. It impairs judgement just like alcohol. Most of us wouldn't carry a gun while drunk and wouldn't be surprised if a drunk struggled to follow the commands of an officer. I'm not sure how Castile's case is any different. I have little sympathy for someone who gets stoned while riding around with his four year old daughter to begin with. While the impairment from marijuana is not as extreme as alcohol, it still reflects incredibly poor, selfish judgement.