(SOUNDBITE OF TRUCK BEEPING) MANN: In Fairfield, California, a government truck backs up to another illegal grow house, ...

Traces of harmful substances like pesticides, molds and heavy metals might be lurking in marijuana as states struggle to ...

In much of the U.S., illegal cannabis outcompetes legal weed sold in licensed shops. For consumers, it can be difficult to ...

In California ... more regulated weed: "The general public largely assumes, 'Hey, it's in a state-regulated store. It's got to be as pure and regulated as any other product I buy in a state ...