The prefix lok (derived from lokken or to tempt) is one of those prefixes that can be stuck in front of all sorts of words when describing tricks used by the police to lure crooks into committing a crime. For example, a lokauto is a car fitted with a camera, a lokfiets is a bike with a transmitter, lokgraffiti is graffiti used to attract other graffiti artists and a lokhoer is a policewoman pretending to be a street prostitute.