Three Smith Township police officers face charges ranging from perjury and conspiracy to robbery and assault, filed yesterday by Washington County District Attorney Steven M. Toprani in an ongoing misconduct investigation.

Derek Afif Dayoub, 26, of Scott, who last month was charged with assaulting an employee at a Burgettstown McDonald's, faces additional charges that he threw a man head-first into the rear tail light of a car, smashing the lens, Mr. Toprani said. Mr. Dayoub then emptied an entire can of pepper spray on the man, John J. Dvorsak, an attack Mr. Toprani said Officer Dayoub did "intentionally without provocation."

Officer Dayoub is charged with simple assault and official oppression in that incident, which the district attorney said happened in September. He faces the same charges and a harassment charge in an October incident, during which Mr. Dayoub confronted McDonald's employee Brian Lancaster, 19, and squeezed a pressure point that caused him to collapse, an affidavit says.

In another case, Mr. Toprani charged Michael Andre North, 30, of McDonald, with burglary, robbery, theft and official oppression. The district attorney said the officer forced his way into Nancy Lugaila's house in December, accused her of selling prescription drugs and then searched drawers in her bedroom. Officer North found a vial with five hydrocodone tablets legally prescribed to the woman by her doctor, and stole three of the tablets before leaving her house, Mr. Toprani said. He returned later that day in search of the remaining tablets, which Ms. Lugaila told police she had hidden.

Officer North last month was charged with buying what he believed were oxycodone pills, a prescription painkiller, from a police informant.

Along with those offenses, Officer North faces perjury and conspiracy charges. Officer North and Amber Price stopped motorist Harold Huber and later lied to justify a search warrant of the man's house. They repeated the statement in police reports and court testimony, but Officer North later said it was untrue, according to Mr. Toprani.

Officer Price, 39, of Oakdale, was charged with conspiracy, official oppression and false swearing in official matters.