More than a dozen states have laws limiting what sex offenders can do on Halloween. But that is not the case in South Dakota, Minnesota or Iowa.
In some states people convicted of a sex crime have a holiday curfew.
In others, those on probation can't decorate their homes, wear costumes or hand out candy. One state even bans offenders from going to a corn maze.
Sioux Falls has a low crime rate, and October 31st is no exception.
"We've never had any problems with sex offenders on Halloween," Sam Clemens said.
In South Dakota, there are no laws prohibiting sex offenders from passing out candy.
"After they're convicted, the judge may impose some probation requirements
Though Sam Clemens with Sioux Falls Police says there haven't been any problems in the area, he understands why some parents are concerned this time of year.
"A lot of it probably has to do with going door to door and not knowing who lives at those houses. You always think Halloween is a fun time, but it can be a little intimidating if you don't know the people who live there," Clemens said.
Even so, Clemens recommends parents plan ahead. If you want to find out who lives in your neighborhood, you can go to the South Dakota Sex Offender Registry website. Using a map, you can see if any sex offenders live in your neighborhood, or nearby.
Clemens says when it comes to Halloween; parents should sit down with their kids, and know where they plan to trick-or-treat.
"If there's places you're not comfortable with, then just avoid those all together," Clemens said.
We also found two national studies that analyzed child sex crime rates on Halloween.
Researchers looked back several years and in both cases they found that the crimes are no more common on Halloween than any other day.