LOS ANGELES (Reuters) - White powder, later determined to be cocaine, was found in the Beverly Hills hotel bathroom where singer Whitney Houston drowned accidentally in a bathtub in February, according to the full coroner's report released on Wednesday. Detectives also found a rolled up piece of paper, a small spoon and a mirror - all items used by cocaine users - in the bathroom shortly after Houston's naked body was found in the bathtub, the Los Angeles County Coroner's report said. Houston, 48, who had a history of drug addiction, was found dead on February 11. ...