The public can run a background check on someone and see if they are listed on the sex offender register list.
However the public cannot directly access the sex offender list that the sex offender is registered on.
The police and other law enforcement and anyone else that is monitoring the sex offenders only have the access to the actual sex offender register database.
But when you pull up a background check on someone the information can be pulled up to alert you that the person is a sex offender.
But you won't get all the same information that a law enforcement person would be able to get when they have the actual access to the sex offender list.
I wish the actual sex offender list was accessible to the public but it's not.