FALSE IMPRISONMENT - Any intentional detention of the person of another not authorized by law is false imprisonment. It is any illegal imprisonment, without any process whatever, or under color of process wholly illegal, without regard to the question whether any crime has been committed or a debt due.
But I like this one.... Nonconsensual its a big word..so look it up if you got to.
Under California law, false imprisonment is the 'nonconsensual, intentional confinement of a person, without lawful privilege, for an appreciable length of time, however short.' Fermino v. Fedco, Inc., 872 P.2d 559, 567 (Cal.'94)
more here
False Imprisonment
The detainment or arrest of a person without a warrant, with an illegal warrant, or with a warrant illegally executed. So long as the person is deprived of his personal liberty, the amount of time actually detained is inconsequential. see, e.g. Schenck v. Pro Choice Network