Drugs
The use of illegal drugs, including clubbing drugs such as ecstasy, is quite prevalent in Vegas. Dealers will approach you all over town, but take care. And always watch your drinks: illicit drugs are sometimes slipped into unattended glasses.
The local authorities have a strict zero-tolerance policy on drug use and trafficking. If you're implicated in a drug sale or purchase, you will be arrested and charged, and if convicted could receive a maximum sentence of five to ten years in jail.