An Iowa lawmaker vows to fix a loophole in state law which lets sex offenders move around the state without registering their address with local authorities. A state law requires released sex offenders to let local police or sheriffs know where they live. The Iowa Supreme Court has ruled that if a sex offender registers once, the state cannot punish him or her for moving and failing to give officials a change of address. Representative Chuck Larson of Cedar Rapids says the ruling makes the law meaningless.Larson, who is the chairman of the House Judiciary Committee, says fixing the loophole is one of his priorities.The Supreme Court ruling was issued within the past month and involved an Osceola County resident who was prosecuted for failing to register his whereabouts with authorities.