N.Y. Crim. Proc. Law § 705.05

§ 705.05 Pen register and trap and trace authorizations; in general.\n Under circumstances prescribed in this article, a justice may issue an\norder authorizing the use of a pen register or a trap and trace device\nupon ex parte application of an applicant who is authorized by law to\ninvestigate, prosecute or participate in the prosecution of the\ndesignated crimes which are the subject of the application.\n