MADISON, Wis. -- Authorities are advising parents to check the state Sex Offender Registry when planning trick-or-treat routes for Halloween.

Sex offenders under supervision are prohibited from taking part in any Halloween activities, WISC-TV reported. They aren't allowed to have porch lights on or to hand out candy. They must also stay indoors during trick-or-treat hours and can't leave the house unless they have agent approval to go to work.

However, those rules only apply to those still reporting to a probation or parole agent.

"For those individuals, we recommend parents log on to our Web site, look up sex offenders that are in their area and just be aware as they're planning trick-or-treat routes for their children," said John Dipko, public information director at the Department of Corrections.

Officials said the Wisconsin Sex Offender Registry Web site also has links to helpful information and safety brochures.

Authorities recommended that parents discuss protective behaviors with children, supervise children while they go door to door and make sure children know what to do in case of emergency or if they feel uncomfortable.