N.Y. CPL Law § 700.10

§ 700.10 Eavesdropping and video surveillance warrants; in general.\n 1. Under circumstances prescribed in this article, a justice may\nissue an eavesdropping warrant or a video surveillance warrant upon ex\nparte application of an applicant who is authorized by law to\ninvestigate, prosecute or participate in the prosecution of the\nparticular designated offense which is the subject of the application.\n 2. No eavesdropping or video surveillance warrant may authorize or\napprove the interception of any communication or the conducting of any\nvideo surveillance for any period longer than is necessary to achieve\nthe objective of the authorization, or in any event longer than thirty\ndays. Such thirty day period shall begin on the date designated in the\nwarrant as the effective date, which date may be no later than ten days\nafter the warrant is issued.\n