If this passes, it will be perfectly legal to drive while high. The current testing only test if someone took the drug in the last week or so. The test to see if the drug is currently in the bloodstream uses a machine that is prohibitively expensive. Drug users will be able to damage property and injure people with impunity.
People who smoke dope drive slower dude.
For me, it started one night at a party when we ran out of grass and I volunteered to replenish the supply. I stepped into my Austin Healey 3000 roadster and sped down the freeway at around 90 mph, oblivious to the fact that the highway had not yet opened or even been completed. Miraculously, I hit the brake just short of a flimsy barrier perched atop a 40-foot chasm.
Roadside sobriety tests are not at precise as breathalyzers, and I foresee no end of lawsuits and juries that have become accustomed to the idea that evidence should be precise and completely objective with nothing that can be seen as subjective.
Considering how prevalent pot use is, I think it is absurd that more of an effort has not been made to find a way of determining if someone is impaired by it. The need for a reasonably prices and usable device already exists. I don't really know if the technology is cost prohibitive, or if research into it is being obstructed by the DEA and FDA.
More like four to ten weeks. Good thing pot is nowhere as debilitating as alcohol and some other street drugs. But still, I don't see how law enforcement could deal with legally stoned people driving with any consistency. Just say you smoked last week. Hard to prove otherwise with standard tests.