Teen pilot wasn't on drugs, tests indicate

TAMPA, Florida (CNN) -- Toxicology tests show the teen-age pilot who crashed a private plane into a Tampa office tower did not have alcohol or drugs in his system when he died.

Dr. Wayne Duer, chief forensic toxicologist with the Hillsborough County medical examiner's office, said Wednesday that blood tests on Charles Bishop, 15, came back negative for a number of substances, including opiates, antidepressants, stimulants, marijuana, PCP and cocaine.

Accutane, the acne medication that some have linked to depression and suicidal tendencies, was not detected in the teen-ager's system. Pinellas County sheriff's deputies said Bishop had been prescribed Accutane, but it was unclear if he had taken the medication.

Bishop flew a single-engine plane into the 42-story Bank of America Plaza building in downtown Tampa on January 5, killing himself instantly. No one else was injured.

After the crash, police found a note in his pocket expressing support for Osama bin Laden and the September 11 attacks, an opinion that family and friends said he had not expressed previously.

Duer said another test is being conducted but said he doesn't "expect to find anything of consequence" in it.