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DATE:​​July 16, 2019​/ 7:00 p.m.​​​​​​​  

INCIDENT:​HS 11370.1- Possession of a Controlled Substance While Armed

​PC 29800 (a) (1) – Felon in Possession of a Firearm

​PC 30305 (a) (1) – Unlawful Own of Ammunition

​PC 496 (a) – Possession of Stolen Property

​PC 12022.1 – New Offense While Out on Bail

​HS 11370 (A) – Possession of a Controlled Substance


LOCATION:​Helms Ave / Devon St, Rancho Cucamonga​

SUSPECT:​Chester Gumber III, 40-year-old resident of Rancho Cucamonga

​Pamela Martinez, 43-year-old resident of San Dimas​


While on patrol, deputies from the Rancho Cucamonga Police Department observed a suspect related to continued narcotics activity driving west on Devon St.  Deputies conducted a traffic stop and identified the driver as Chester Gumber III and the passenger as Pamela Martinez.  Rancho Cucamonga Police Department’s narcotics detectionK9 Smokey was deployed and alerted to narcotics inside the vehicle.  When deputies searched the vehicle, they found methamphetamine and a loaded firearm with additional ammunition inside a satchel.  Deputies located additional methamphetamine inside Martinez’s purse.  Upon further investigation, deputies learned the firearm had been reported stolen in 2017.  Both Gumber III and Martinez were arrested and booked at the West Valley Detention Center.

Anyone with information regarding this investigation is urged to contact the Rancho Cucamonga Police Department.  Callers wishing to remain anonymous can call the We-tip Hotline at 1-800-78-CRIME (27463) or you may leave information at

Refer:​​Deputy Derek Pedersen

Station:​​Rancho Cucamonga Police Department 

Phone No.  ​​(909)477-2800