New York Codes, Rules and Regulations
Title 22 - JUDICIARY
Subtitle A - JUDICIAL ADMINISTRATION
Chapter I - Standards and Administrative Policies
Subchapter C - Rules Of The Chief Administrator Of The Courts
Part 111 - Procedure Under Cpl Article 730
Section 111.6 - Certificate of custody

When defendant is in the custody of the Commissioner of Mental Health at the expiration of the period prescribed in a temporary order of observation or at the expiration of the authorized period prescribed in the last order of retention, the director of the institution where the defendant is confined may act as the agent of the Commissioner of Mental Health in certifying to the court that the defendant was in the custody of the Commissioner of Mental Health on such expiration date.