A couple of month ago I blogged about the difficulty law enforcement has proving that someone is driving under the influence of marijuana. The cops may suspect the person of driving under the influence of marijuana but because there is not a readily available and reliable chemical test as there is for alcohol it is sometimes difficult for the prosecution to secure a conviction.
That may soon change. A bill introduced in the California Senate in February 2016 would allow officers to use a hand-held electronic device which is able to test for the presence of marijuana and other drugs by use of an oral swab. The bill, if it becomes law, will allow chemical testing for drugs in the same way that chemical tests for alcohol are now used. As with alcohol testing, refusal to submit to the drug test would result in enhanced penalties including the mandatory suspension of the person’s license to drive for one year. The bill, SB 1462 is currently in committee.
Critics of the swab testing maintain that the technology is unproven and that the accuracy of such tests has not been scientifically demonstrated. The swab tests are being used in test programs around the country, including in some California counties. These programs are being monitored by the federal government. Should SB 1462 become law, there will surely be challenges to the swab tests and it may take years for the challenges to wind their way through the appellate courts.
Orange County DUI Lawyer Blog

