Police have released details of Tiger Woods DUI arrest.  It looks like pain killers might be to blame, via ESPN:

Woods told police he was taking several prescriptions, including two painkillers. Police said Woods was "cooperative as much as possible" and that he agreed to take a breath test and a urine test. He blew a 0.00 in the breath test.

As Woods claimed in his statement about his arrest, he was not drunk.  Just driving around on pain killers at 3am.

Maybe a pain killer habit is to blame for Tiger's fall?