by Maia Szalavitz
Read more: 7% of California Drivers Test Positive for Marijuana, but Are They Impaired? | TIME.com
Wouldn't you feel secure looking over to see this guy driving next to you?
For the 20 states in which marijuana is legal, either for medicinal or recreational purposes, theres a new challenge for law enforcement: judging whether stoned users are too impaired to drive.
Read more: 7% of California Drivers Test Positive for Marijuana, but Are They Impaired? | TIME.com
Wouldn't you feel secure looking over to see this guy driving next to you?