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.
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Jackson was booked on charges of contributing to the delinquency of a minor and the juveniles on narcotics charges.