The Nevada crime of trespass doesn't necessarily have to do with sneaking onto someone else's property or defying “No Trespassing” signs. According to NRS 207.200, you may commit trespass in Nevada simply by staying on another person's property after being asked to leave. The following scenario occurs in Las Vegas trespass cases all the time, and many of them involve casinos:
If you're in a casino and are being too noisy, a security officer may appear and ask you to leave. Unfortunately, the officer may be very rude about it, and, in an attempt to defend yourself, an altercation quickly ensues. Since you technically stayed on the premises after you were ordered to go, the guard may call the police and have you arrested for trespass in Nevada.
Luckily, NRS 207.200 is only a misdemeanor crime, and jail is rare for a first offense. However, since trespass looks bad on your criminal record, it's worth hiring an experienced criminal defense attorney to attempt to get the case dismissed. (Also refer our article, "How do I get arrested for trespass in Nevada?")