LAKE WORTH – The case against a teenager accused of delivering drug-tainted cookies to police crumbled Thursday after scientific tests revealed no traces of narcotics. Christian Phillips, 18, became a cookie monster and the butt of jokes around the globe following his arrest Tuesday after he left a basket of treats at Lake Worth police headquarters. Authorities said then that "field tests" they conducted on the cookies showed traces of marijuana and LSD. But lab tests performed by the Tarrant County medical examiner's office were negative for drugs, and Mr. Phillips – who had been charged with tampering with a...