N.Y. Crim. Proc. Law § 705.10

§ 705.10 Orders authorizing the use of a pen register or a trap and\n trace device; when issuable.\n An order authorizing the use of a pen register or a trap and trace\ndevice may issue only:\n 1. Upon an appropriate application made in conformity with this\narticle; and\n 2. Upon a determination that an application sets forth specific,\narticulable facts, warranting the applicant's reasonable suspicion that\na designated crime has been, is being, or is about to be committed and\ndemonstrating that the information likely to be obtained by use of a pen\nregister or trap and trace device is or will be relevant to an ongoing\ncriminal investigation of such designated crime.\n