BRIDGEPORT -- A suspect pulled his pants down to get rid of drugs he was carrying, police said.

Philip Rivera, 26, of Bunnell Street was seen going through a stop sign on Stillman Street on Wednesday night, and acted "nervous and evasive'' when officers pulled him over for a motor vehicle violation, the incident report states.

After he was patted down for weapons, Rivera was put into the back of a police cruiser and officers noted him fidgeting in his seat. The suspect had his zipper open and his pants and belt undone, the report states.

Two yellow and three white envelopes, all marked with the word "FLOW,'' were found on the seat next to the suspect, police said. The envelopes, each containing a brown powder that appeared to be narcotics packaged for street sale, were not there moments earlier, they said.

Rivera also had $806 in cash in his pockets, the report states. The 1.9 grams of borwn powder tested "presumptively positive'' for heroin. Rivera was charged with possession of narcotics, possession with intent to sell and interfering with an officer.

He was held overnight on a $15,000 bond and is expected to be arraigned later Thursday at Superior Court. Rivera is currently on probation from a previous conviction, police said.