NEW HAVEN, Conn. (AP) — As police charged a Yale animal lab technician with murdering a graduate student who worked in his building, a portrait began to emerge Thursday of an unpleasant stickler for the rules who often clashed with researchers and considered the mice cages his personal fiefdom. Police charged 24-year-old Raymond Clark III with murder, arresting him at a motel a day after taking hair, fingernail and saliva samples to compare with evidence from the grisly crime scene at Yale’s medical school.