People keep secrets.  The only thing to unmask those sometimes dangerous secrets, is to educate yourself.

In the state of Iowa, it not a law that registered sex offenders have to go up to their neighbors and tell them they are a sex offenders. So that means that people could have a sex offender living near-by unknowingly. There is a super easy site that will show registered sex offenders that live near you. https://www.iowasexoffender.gov/map/

Just type in an address or postal code, then choose the mile radius (1-10). Click the different pins to learn about the person. Information like their name, address, aliases, other past convictions, and more. Doing this is a simple way to stay safe.