Los Angeles Times
By George Skelton
Californians seem hot to visit a legal pot shop and smoke a joint or munch a weeded brownie. But driving home could be risky.
No one — not even highway patrolmen — knows precisely how stoned a motorist can be before he’s dangerously under the influence of cannabis.
Unlike with liquor, there’s no 0.08% blood alcohol equivalent for marijuana. There’s not even a common Breathalyzer to measure drugged driving. And there’s nothing around the corner.