"driving while intoxicated"

Video surveillance showed a car ramming the garage door, which was damaged.

As more states make medical and recreational marijuana use legal, they increasingly are grappling with what constitutes DUID, or driving under the influence of drugs, and how to detect and prosecute it. And they’re finding it is more difficult than identifying and convicting drunken drivers.

Now that recreational use of marijuana is legal in four states, law enforcement officials are looking for quicker ways to test drivers for excessive pot use. Entrepreneurs are taking on the challenge.