It is possible to legally prevent an adult from having contact with your minor child; however, it may take a court order and may require that you seek the help of a local attorney. City and county procedures vary greatly across the nation and we simply don't have resources to research all of these. We stick mainly to the State laws.

As far as the police telling him who turned him in, this may be a matter of public record.

In some states, run away teens at the age of 17 fall under a "civil" violation rather than a "criminal" violation. This means Police usually can't or won't use resources on them to pick them up and return them home unless the parents have obtained a court order to do so.

It may be in your best interests to seek out a local attorney for these questions. If she is missing school, or if the 24 your old is contributing to her delinquency, i.e. smoking, drinking, drugs, etc... there may be other laws being violated. A local attorney could advise you on this.

Our research is generally on state criminal laws. The age of consent in Kansas is 16 which means police could not arrest the 24 year old for sexual contact with a minor unless the 24 year old is a teacher or employee of the schools.