False imprisonment occurs when one person unlawfully restricts another's freedom of movement. False arrest requires an arrest, but, false imprisonment only requires unlawful detention.Court concluded as a matter of law that officer had probable cause to arrest plaintiff). 3. Under NRS 200.460, false imprisonment involves detaining another person without a legal cause. Under what scenarios may a casino detain a suspect, and when is it false imprisonment? A summary of the Nevada law. Under our law, a person is guilty of Unlawful Imprisonment in the Second Degree when he or she restrains another person. Nevada police can stop and detain you based on reasonable suspicion. Though in order to arrest you, the police need probable cause. The defendant filled out an incident report about the assault but did not assist in applying for the arrest warrant.