Maybe your kids were among the thousands of Trick-or-Treaters Tuesday night.
But they weren't the only ones going door to door - local Tucson law enforcement officers were knocking on the doors of sex offenders in Southern Arizona.
Many registered sex offenders checked in with the Pima County Adult probation Center to avoid getting a visit from officers at their home.
Those who checked in were accounted for and stayed at a facility until trick or treating wrapped up.
It's called Operation Safe treat - U.S. Marshals along with probation officers from the Pima County Adult Probation go door to door to check on registered sex offenders on Halloween.
I rode along with US Marshals & Pima County Adult Probation to make sure Sex offenders were in compliance on Halloween. Tune in @kgun9
— Jennifer Martinez (@Jennymartineztv) November 1, 2017
"We're doing compliance checks to make sure they're not putting up any sort of Halloween decorations and making sure they're not enticing kids to go trick or treating at their house," says Michael Adams with the U.S. Marshals
They go across town to make sure registered sex offenders don't have Halloween decorations and make sure their porch lights are off.
Adams says, "Most of the guys and girls know that we are coming and they're familiar with the procedures that we do."
In Tucson, there are about 1,018 registered sex offenders.
On Halloween, Law enforcement knocked on 187 doors.
If they're in violation, they're arrested on the spot.
If they're not home, officers need to find them.
To find Sex offenders in your neighborhood, click here.