I'll give you an example, IIIbay, as I live in one of the states where this is legal. We haven't had an accident yet, in either state, after more than two months (dozens of drunk driving deaths in that time), and the media is asking the police questions as to why. The police have to TRAIN their members to recognize those that have smoked. Their biggest complaint is that smokers are not failing field sobriety tests. In other words, even a police officer CANNOT tell if someone has used marijuana. It is the same as trying to tell if someone has drank 5 espressos, the effect is similar in intensity. Now I ask you this, have you ever had a hard time identifying a drunk? I can tell one OVER THE PHONE. I can see them from 10 yards.