Pilot of tanker that struck San Francisco Bay , ` ` medically unfit , '' NTSB says . Man was taking ` ` a half - million impairing prescription drugs , '' report said . Crash in 2007 caused oil spill that killed about 2,500 birds , report says . Supervisor 's poor judgment also cited as factor in NTSB investigation .
Pilot of tanker that struck San Francisco Bay Bridge `` medically unfit , '' NTSB says . Man was taking `` a half-dozen impairing prescription medications , '' report says . Crash in 2007 caused oil spill that killed about 2,500 birds , NTSB says . Supervisor 's poor oversight also cited as factor in NTSB report .