what are you all going to say after someone stoned kills a family member in a traffic accident??
I-502 has placed ridiculously strict limits when it comes to issuing DUIs. Basically, you cannot have more than 5 micrograms of THC in your blood stream while driving.

That being said, alcohol is a much higher factor when assessing aggressive and violent behavior - especially while driving. The number of people killed in car accidents caused by a drunk driver is higher than that of those under the influence of THC.