BRADENTON BEACH, Fla. – When Paris Hoisington and her family found a message in a small bottle on the beach last month, it seemed the story had ended with the bottle’s 4,600-mile, eight-year journey.

Sex crimes include rape, child abuse, sex trafficking and indecent exposure. Recent years have seen an increase in internet grooming of children by sexual predators. In 2011, Scotland's Lord Advocate ...