STLtoday.comTheater shooting: No red flags reported at time of gun saleSTLtoday.comCARROLLTON, Ga. (AP) — John Russell Houser's mental problems were well known to many, though perhaps not to the store that sold him the .40-caliber handgun used in a deadly attack on a Louisiana movie theater. A federal background check came ...Louisiana shooting suspect never involuntarily committed: Georgia authoritiesReutersNo red flag on La.