The state Civil Service Commission has upheld a 2012 decision by the town to fire police officer Adam Levesque on grounds he falsified records and engaged in other alleged misconduct in 2010. Levesque joined the department in 2001, according to the 32-page decision by Administrative Magistrate Angela McConney Scheepers. In it, Scheepers said Levesque had been warned about his behavior and had already signed a “last chance” agreement with Police Chief Bruce Gates after allegedly informing a suspected drug dealer that he was being watched. Then, allegations were raised that Levesque doctored traffic stop records on the “Click-It or Ticket” program to make a daily quota. The former officer was earning state-paid overtime on the traffic detail that checks motorists for seatbelts. Levesque’s behavior “was not only fraudulent, but easily discoverable,” Scheepers said, and his conduct was “unbecoming” an officer of the town force. Town Manager Charles J. Cristello said he doesn’t comment on personnel matters. “The documents speak for themselves,’’ he said in an e-mail. Levesque’s attorney, Timothy G. Kenneally, could not be reached for comment.