N.Y. Gen. Bus. Law § 218
In any action for false arrest, false imprisonment, unlawful detention, defamation of character, assault, trespass, or invasion of civil rights, brought by any person by reason of having been detained on or in the immediate vicinity of the premises of (a) a retail mercantile establishment for the purpose of investigation or questioning as to criminal possession of an anti-security item as defined in section 170.47 of the penal law or as to the ownership of any merchandise, or (b) a motion picture theater for the purposes of investigation or questioning as to the unauthorized operation of a recording device in a motion picture theater, it shall be a defense to such action that the person was detained in a reasonable manner and for not more than a reasonable time to permit such investigation or questioning by a peace officer acting pursuant to his special duties, police officer or by the owner of the retail mercantile establishment or motion picture theater, his authorized employee or agent, and that such officer, owner, employee or agent had reasonable grounds to believe that the person so detained was guilty of criminal possession of an anti-security item as defined in section 170.47 of the penal law or was committing or attempting to commit larceny on such premises of such merchandise or was engaged in the unauthorized operation of a recording device in a motion picture theater. As used in this section, "reasonable grounds" shall include, but not be limited to, knowledge that a person (i) has concealed possession of unpurchased merchandise of a retail mercantile establishment, or (ii) has possession of an item designed for the purpose of overcoming detection of security markings attachments placed on merchandise offered for sale at such an establishment, or (iii) has possession of a recording device in a theater in which a motion picture is being exhibited and a "reasonable time" shall mean the time necessary to permit the person detained to make a statement or to refuse to make a statement, and the time necessary to examine employees and records of the mercantile establishment relative to the ownership of the merchandise, or possession of such an item or device. Such detention at such vicinity shall not authorize the taking of such person's fingerprints at such vicinity unless the taking of fingerprints is otherwise authorized by section 160.10 of the criminal procedure law and are taken by the arresting or other appropriate police officer or agency described therein in accordance with section 140.20 or 140.27 of such law. Whenever fingerprints are taken, the requirements of article one hundred sixty of the criminal procedure law shall apply as if fully set forth herein.
N.Y. Gen. Bus. Law § 218