N.Y. County Law § 654

§ 654. Deputizing local police officers or peace officers. The sheriff\nmay in his discretion deputize the police officers or peace officers of\ncities, towns, villages and special districts and agents of societies\nincorporated for the purpose of prevention of cruelty to animals, for\nthe purpose of authorizing an arrest without a warrant outside the\nterritorial limits of such city, town, village or special district, when\nsuch crime or infraction was committed within such territorial limits in\nthe presence of such officer. Such officer shall not be deemed an\nofficer, agent, servant or employee of the county.\n