I am not sure this accomplishes anything. First of all you need to teach your child how to protect themselves. You cannot be with them all the time. And secondly, people are so focused on children being molested by strangers, they forget or do not know that most of the time children are not molested by registered sex offenders, but by family members and family friends.
It actually can be VERY helpful. Most offenders work by "grooming" their victims..
They meet them often in "safe" places...
They will go to these places daily and see these same kids and work to get their trust..
"Oh, what book are are reading little girl? I have a daughter at home sick that likes to read...what would you suggest I get for her?"
So this guy doesn't seem scary right? She helps him find a book..makes her feel helpful..
Few days later...
"Oh hello! Glad to see you again!! My daughter LOVED that book! Do you have any other suggestions?.."
Etc..etc..then he starts asking smart questions...seeing if she'll be one that he'll be able to lure away from the library...or to a quiet corner of the library..
"Oh..can you come to my house and meet my little girl? Shes SO lonely stuck at home (with whatever disease he made up to make the kid feel sad for the fake "daughter".. Can you come and read her a story?
Or.."shes waiting in my car to meet you, because you made her so happy by picking out all those nice books for her. She wants to tell you thank you!..(shes too sick to come inside ..)"
Trust me...it happens more than you can ever ever imagine...