N.Y. Criminal Procedure Law § 410.50 – Custody and supervision of probationers

1. Custody. A person who is under a sentence of probation is in the legal custody of the court that imposed it pending expiration or termination of the period of the sentence.
2. Supervision. The probation department serving the court that imposed a sentence of probation has the duty of supervising the defendant during the period of such legal custody.
3. Search order. If at any time during the period of probation the court has reasonable cause to believe that the defendant has violated a condition of the sentence, it may issue a search order. Such order must be directed to a probation officer and may authorize such officer to search the person of the defendant and/or any premises in which he resides or any real or personal property which he owns or which is in his possession.
4. Taking custody without warrant. When a probation officer has reasonable cause to believe that a person under his supervision pursuant to a sentence of probation has violated a condition of the sentence, such officer may, without a warrant, take the probationer into custody and search his person.
5. Assistance by police officer. In executing a search order, or in taking a person into custody, pursuant to this section, a probation officer may be assisted by a police officer.