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What do they do now?

Therein lies the rub. There really is no reasonably quick test to determine this. From Wikipedia I found the following:

Unlike alcohol, for which impairment can be reasonably measured using a breathalyser (and confirmed with a blood alcohol content measurement), valid detection for cannabis is time-consuming, and tests cannot determine an approximate degree of impairment. The lack of suitable tests and agreed-upon intoxication levels is an issue in the legality of cannabis debate, especially regarding intoxicated driving

This is problematic if we cannot quickly determine if someone is "under the influence". Of course this rather salient point was swept under the rug by the pro-pot folks. I will concede that if a person is arrested, then more "invasive" tests could be done to determine the level of cannabis but sometime those tests are done hours after the alleged crime has been committed.