A policewoman in New York was on the red-light district on a decoy sting, posing as a prostitute in an effort to catch anyone attempting to procure her services. After a couple of arrests the local pros (Legitimate Ladies of the night) called a nearby evangelical Christian church to send a rather enthusiastic preacher to 'save this poor woman's soul' so he and a few followers arrived shortly after and began preaching the gospel on the very same corner the policewoman stood. This had the effect of driving away her potential customers as well as annoying the policewoman.  In an effort to get rid of them she produced her badge to the preacher whereupon he asked "Don't they pay you enough to be a  
policewoman nowadays dear?"