LAS VEGAS -- The three Las Vegas police officers involved in Saturday's shooting at a Costco have been identified. Officers William Mosher, Joshua Stark and Thomas Mendiola shot and killed Erik Scott at a Summerlin Costco. Officers say Scott had a weapon and pointed it at them. Mosher has been with Metro for five years. Stark and Mendiola have been with Metro for under two years. All are assigned to the Metro's Northwest Area Command. This isn't the first time Officer Mosher has been involved in a shooting. In April of 2006, Officer Mosher and Officer John Wiggins shot and...