LOS ANGELES (AP) — A short walk from police headquarters in the heart of downtown Los Angeles, a cluster of bustling shops are openly selling packaging and hardware that can be used to produce counterfeit marijuana vapes that have infected California's cannabis market.

Bootleggers eager to profit off unsuspecting consumers are mimicking popular, legal vape brands, pairing replica packaging churned out in Chinese factories with untested, possibly dangerous cannabis oil produced in the state's vast underground market.

The result: Authentic-looking vape cartridges sold by unlicensed dispensaries...