Maybe the states should decide if they want to legalize prostitution or not.
As if Las Vegas (Clark County) LEOs don't have enough to handle with the casinos and hotels and millions of visitors from every corner of the world every year, maybe they'd rather not be trying to distinguish between "legal" hookers and the amateurs who allegedly flock (sp?) there during big conventions and trade shows. Arrest them all and there will be no confusion.
This anti-hooker attitude also contributes to the "family-friendly" image Las Vegas is trying to cultivate. The rest of the state could care less about image.
Such local option should not apply, of course, to real crimes such as kidnapping, rape, assault, murder, theft, arson, etc., for which the accused would be tried in a state court and imprisoned in a state prison if found guilty. (Could you imagine the impact on prisons if hookers were thrown in the joint with rapists, murderers and convicted child molesters?)