A special prosecutor has declined to bring charges against nine UW-Madison researchers and officials responsible for experiments in which sheep died of decompression sickness. David Geier, a Madison attorney, wrote in a report filed Friday that university employees did not violate a state law that bans killing animals through decompression. Geier wrote that the university should not ?receive a free pass,? however, because officials should have a better system to keep track of state and federal laws. He found that university employees he interviewed were either unaware of the state law or did not think it applied to them.