Petrochemical giant BP didn't file a plan to specifically handle a major oil spill from an uncontrolled blowout at its Deepwater Horizon project because the federal agency that regulates offshore rigs changed its rules two years ago to exempt certain projects in the central Gulf region, according to an Associated Press review of official records. The Minerals Management Service, an arm of the Interior Department known for its cozy relationship with major oil companies, says it issued the rule relief because some of the industrywide mandates weren't practical for all of the exploratory and production projects operating in the Gulf region. Robert Wiygul, an Ocean Springs, Miss., environmental lawyer, said the lack of a blowout scenario is kind of an outrageous omission, because you're drilling in extremely deep waters, where by definition you're looking for very large reservoirs to justify the cost. If the MMS was allowing companies to drill in this ultra-deep situation without a blowout scenario, then it seems clear they weren't doing the job they were tasked with," he said. "The MMS can't change the law just by telling people that they don't have to comply with it."