Well, cops can
   lie:[1]http://www.snopes.com/risque/hookers/cop.asp as part of
   their job. Also, keep in mind that Trent Goodbaudy sells books
   and other materials, so I take his films with a grain of salt.
   Are they possibly true? Yes, it's possible. But it's important
   to know someone's agenda when they show you something. That
   doesn't invalidate it, but it's easy to be led to believe
   something when we want to believe it.

References

   Visible links
   1. http://www.snopes.com/risque/hookers/cop.asp