Pilot of tanker that struck San Francisco Bay , ` ` medically unfit , '' NTSB says . The report also blamed the ship 's operator , Fleet Management Ltd. , for not properly training crew members and the U.S. Coast Guard for not providing adequate medical oversight of the pilot . 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 , ` ` 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 .