SAN FRANCISCO (KRON) -- A man who was stopped by BART police after allegedly “piggybacking” the Civic Center station gates behind a paying commuter faces multiple gun and drug charges, San Francisco District Attorney Brooke Jenkins announced Friday. Martinez Guillory, 51, allegedly exited the San Francisco BART station gates without paying on Wednesday at around 7:21 p.m. After being detained by a BART Police Department officer, court documents said a search of Guillory’s backpack uncovered: 9 mm Glock 26 semi-automatic pistol Pistol magazine loaded with 17 rounds of ammunition Suspected heroin (105.3 grams) Cocaine (39.6 grams) Cocaine base (59.4 grams) Packaging material Digital scale DA Jenkins announced formal charges Friday, including possession of a firearm by a felon, carrying a concealed firearm, possession of ammunition, possession for sale of cocaine base and possession for sale of a controlled substance. San Francisco hit-and-run suspect dead after police shooting Friday The SF District Attorney’s Office said this case is the first it has filed with an arming allegation since Proposition 36 went into effect on Wednesday. Prop 36 was passed by California voters in the November election and allows for felony charges and increased sentences for certain crimes. Guillory is expected to be arraigned in court on Friday afternoon.