California may require labels on pot products to warn of mental health risks

Liz Kirkaldie says her grandson's marijuana use led to his schizophrenia diagnosis. She says she's skeptical the labels will work, "But if it helps even one person? Great." (Beth LaBerge/KQED)

Liz Kirkaldie's grandson was in the top of his class in high school and a talented jazz bassist when he started smoking pot. The more serious he got about music, the more serious he got about pot.

And the more serious he got about pot, the more he became paranoid, even psychotic. He started hearing voices.