Sheriff Mike Byrd of Jackson County, accused of using his office to retaliate against people he considered political and personal enemies, has been indicted on charges that include fraud, embezzlement, perjury, extortion and witness tampering. One of the charges said Sheriff Byrd forced a detective to sign a criminal affidavit against a man in a murder case in 2007, despite the detective’s objections that he did not believe the man committed the crime. The 31-count indictment, made public on Friday, said Sheriff Byrd was seeking re-election and wanted to be able to say there were no unsolved murders in the county. Sheriff Byrd’s lawyer, Joe Sam Owen, did not respond to a message.