N.Y. Criminal Procedure Law § 140.05: Arrest without a warrant; in general

§ 140.05 Arrest without a warrant; in general.

A person who has committed or is believed to have committed an offense

and who is at liberty within the state may, under circumstances

prescribed in this article, be arrested for such offense although no

warrant of arrest therefor has been issued and although no criminal

action therefor has yet been commenced in any criminal court.