Last summer, 48-year-old Stephen Obbish was found dead in the backseat of a Punxsutawney Boro police car.     And, on Monday the state Attorney General's office disclosed that it would not be filing any criminal charges in connection with its investigation into this matter.     As you may recall, the Attorney General's office took over the probe because of a conflict of interest.     Punxy Boro Police had first arrested Obbish because of his suspected public drunkenness.     Arresting officer Brian Andrekovich had had left the man in a police car for five hours and that is where Obbish was found dead.     The Jefferson County Coroner had ruled that Obbish died from ingesting a combination of alcohol and drugs.