Capt. John Cota is shown outside the Federal Building in San Francisco, Friday, April 4, 2008. Cota, the pilot of the freighter that spilled 53,000 gallons of oil into the San Francisco Bay, will invoke his right not to testify at a federal investigative hearing, his attorneys say in a letter that directs blame toward the Coast Guard and the ship's master for the incident. (AP Photo/Jeff Chiu)