Nevada's “12 Hour Hold Law” allows police to keep people arrested for DUI in custody until they're no longer under the influence. If they were drunk, police may wait until their BAL reaches .04 percent. If they were high, police can hold them for twelve hours.
NRS 484C.110 criminalizes drivers who operate a vehicle while drunk or high. If a cop suspects you of being in violation of NRS 484.379, he/she may pull you over, ask you questions, and request you perform various field sobriety tests. These tests involve examining your eyes and asking you to walk in a straight line and balance on one foot.
If you're convicted of violating NRS 484.379 for the first time, you can usually get the six month jail sentence suspended. But you'll also face fines, a suspended license, DUI School, and a victim impact panel. Punishments become harsher with each successive DUI. (See our article, "Do I need a lawyer for my Nevada DUI case?")