When California residents voted to permit the use of recreational marijuana last November, the state became one of eight U.S. jurisdictions (along with Washington, Oregon, Nevada, Colorado, Alaska, Hawaii, Maine, Massachusetts and the District of Columbia) to permit the practice. An additional 20 states have laws allowing marijuana use for medicinal purposes.
While the new marijuana laws may offer some relief to people suffering from painful illnesses—and provide a popular alternative to alcohol for those who want to party or simply relax— they are posing a real dilemma for law enforcement officials charged with keeping DUI drivers off the road. The problem? At present there is no widely accepted test or measurement that defines whether a person is too intoxicated by marijuana to drive safely.
Major differences between marijuana and alcohol