The Texas police officer at the center of a controversial video that showed him forcefully handcuffing and drawing his gun on a group of black teenagers at a pool party last weekend has resigned, the city’s police chief announced Tuesday. McKinney Police Chief Greg Conley called Cpl. Eric Casebolt’s actions “indefensible” and noted that the officer, who was under investigation, “resigned on his own will.” “As the video shows, he was out of control during the incident,” Conley said, “I had 12 officers on the scene and 11 of them performed according to their training.” He said the internal investigation...