WATERVILLE — A routine traffic stop led to the arrest of a Vassalboro woman on a crack cocaine possession charge Thursday night, according to police.

Elizabeth Ann Munster, 32, of Oak Grove Road, Vassalboro, was arrested after the 1995 Jeep she was a passenger in was pulled over on Elm Street, according to Deputy Chief Charles Rumsey of the Waterville Police Department. Munster had two warrants out for her arrest on a previous failure to appear charge stemming from a charge of operating a vehicle while her license was suspended, Rumsey said.

Upon searching her, an officer found a half-gram of crack cocaine and a hypodermic needle in her pocket, Rumsey said.

Munster was arrested on the two warrants and also charged with unlawful possession of a scheduled drug, a class C felony, and for violating the conditions of her release. Munster has a March 11 court appearance at Kennebec County Superior Court in Augusta.

The driver of the vehicle, Donald R. Gordon, 47, of Franklin Street in Augusta, was summoned on a charge of possession of marijuana during the traffic stop, Rumsey said.