Trick or treaters weren't the only ones knocking on doors in Pierce County Monday.

Officers with the Washington Department of Corrections were also making their rounds, and checking in on sex offenders.

These door-to-door compliance checks are something the Department of Corrections does year-round, but officers say it's even more important on a night like Halloween, when there are so many children out and about, and often knocking on strangers' doors.

KING 5 tagged along as DOC officers knocked on doors in Tacoma and reminded a group of level three sex offenders that this is one holiday they should sit out. Halloween-specific instructions from officers include not giving out Halloween candy or treats, turning off porch lights, closing blinds, and no outside decorations.

Similar sex offender compliance checks took place in other counties as well.

According to the DOC, there are currently 485 sex offenders living in Pierce County that are supervised by the Department of Corrections. In King County, there are 699 sex offenders currently under DOC supervision.