Peter Henning, Wayne State law professor and former federal prosecutor, comments about the IRS case against Peter Hendrickson, author of a book about how to avoid paying federal taxes. Hendrickson claims only government employees need to pay federal tax - an opinion that has been rejected by the federal courts. The Justice Department disagrees and has filed a civil suit against Hendrickson and his wife, Doreen, in U.S. District Court seeking a court order barring them from promoting what it considers to be the nation's No. 1 tax scheme and forcing them to return more than $20,000 in tax refunds. Henning says tax avoidance schemes can quickly gain legs. \"These tax scams spread like wildfire through the tax protester community. In a sense it\'s a bit like pulling weeds. You pull one out and another creative one pops up,\" Henning said.