Federal authorities are continuing an investigation to determine if Gibson Guitars, a Nashville-based instrument manufacturing company, has purchased wood that was illegally harvested from the rainforests of Madagascar. U.S. Fish & Wildlife Service agents served a search warrant Tuesday (Nov. 17) at Gibson's factory which constructs electric and acoustic guitars. Under the U.S. Lacey Act, trading in banned woods is punishable by civil and criminal penalties or the seizure of property. No arrests have been made or formal charges filed in the case. Gibson officials say they purchase wood "from legal suppliers who are to follow all standards," and that they are fully cooperating with the investigation.