A New Orleans law firm is challenging government assurances that Gulf Coast seafood is safe to eat in the wake of the BP oil spill, saying it poses a significant danger to public health." Citing what the law firm calls a state-of-the-art laboratory analysis, toxicologists, chemists and marine biologists retained by the firm of environmental attorney Stuart Smith contend that the government seafood testing program, which has focused on ensuring the seafood was free of the cancer-causing components of crude oil, has overlooked other harmful elements. And they say that their own testing - examining fewer samples but more comprehensively - shows high levels of hydrocarbons from the BP spill that are associated with liver damage. "What we have found is that FDA simply overlooked an important aspect of safety in their protocol," contends William Sawyer, a Florida-based toxicologist on Smith's team. Five months after crude oil stopped gushing from the broken BP wellhead into the Gulf of Mexico, the federal government has reopened more than 90 percent of fishing waters that were in danger of contamination from the broken Deepwater Horizon rig. But many fishermen have yet to return to sea, and consumer confidence in Gulf seafood remains lukewarm.