False Imprisonment
False imprisonment is the unlawful confinement to a bounded area of one person by another for any length of time whereby he or she is deprived of his or her liberty. Actual physical restraint is not necessary for the tort to occur. If the person reasonably believes that he or she is not free to leave, then a false imprisonment has occurred.
Generally, the injury resulting from false imprisonment is emotional (resulting in, for example, humiliation, fear, or embarrassment). However, physical injuries can occur from the restraint itself or when the person attempts to escape. In either case, the wrongdoer would be liable for all such injuries.
Unless their actions are purposefully unlawful, police officers generally have immunity from lawsuits when acting officially.