HERCULES, Calif. >> Police in Northern California are investigating who gave a plastic bag of methamphetamine to a young girl on Halloween.

Hercules police Sgt. Ezra Tafesse tells the Contra Costa Times the 8-year-old girl’s parents found the powder packaged in a small zip-style bag among the child’s Halloween candy and alerted police Monday.

Tafesse says the girl had been trick-or-treating in the Promenade area of Hercules, a San Francisco Bay Area city, when she was given the bag containing one-tenth of a gram of crystal methamphetamine.

He says it’s not clear if the girl was given the drugs intentionally or accidentally, and police don’t have a suspect.

Tafesse says drugs are slipped into Halloween candy from time to time, but it’s usually marijuana.