A sting is meant to catch criminals during the commission of a crime, where law enforcement officers participate as actors in that crime while undercover in order to observe. Entrapment is similar (and can sometimes be used as a defense in the ensuing case supported by a string operation), where law enforcement officers coerce a subject into doing a crime that they would not otherwise have done. Entrapment is not considered ethical behavior and would, obviously, compromise a case.
Featured is the International Criminal Court in The Hague (Netherlands), which is a quite-new law enforcement agency established in 2002 and an especially bad agency to have be interested in you:
What? How? Wonder. 