A 23-year-old woman and two juveniles were arrested on drug and weapons charges Monday night after a traffic stop west of Highway 99, police reported.
A spokesman said driver Latresse Jackson, 23, and the juveniles were on probation.
The vehicle was pulled over just before midnight at Parkway Drive and Belmont Avenue. Officers found a handgun under the seat and several bottles of promethazine cough syrup.
None of the occupants admitted owning the gun but the juveniles admitted to drinking the syrup.
Jackson was booked on charges of contributing to the delinquency of a minor and the juveniles on narcotics charges.