As more and more states move to legalize recreational marijuana, police are trying to find ways to test motorists suspected of driving stoned.
A chemist at University of California-Berkley has spent the last year and a half developing a breathalyzer that will detect marijuana. It will also be able to detect alcohol.
Although it can be obvious to police officers that a driver is stoned, making an arrest and getting a conviction are two different things.
The breathalyzer should be available sometime next year.