New York Consolidated Laws, Education Law - EDN § 3224. Temporary services

a. If an employer is engaged in a business of assigning employees for temporary services at another establishment, and the employer compensates the employee for such services rendered the employer shall keep on file in his office the employment certificate and shall cause to be delivered to each establishment where the child will perform his services a true copy of such employment certificate.  Such delivery shall be deemed compliance with sections thirty-two hundred sixteen and thirty-two hundred twenty-three of this chapter.  The owner of each establishment to which the child is assigned shall keep on file in his office such copy of the employment certificate, which shall be deemed compliance with sections thirty-two hundred sixteen and thirty-two hundred twenty-three of this chapter, and shall return such copy to the employer at the conclusion of the child's assignment.  Such employer shall note on the original employment certificate the existence of each copy.

b. As used in this section, the term “establishment” includes a factory, mercantile establishment, business office, restaurant, hotel and any other trade, business or service.

c. The commissioner of education may promulgate rules and regulations as he deems necessary to insure that employment under the provisions of this section shall not be harmful or undesirable from the point of view of the welfare, development, or proper education of the child.