N.Y. C.P.L.R. 4515

Rule 4515. Form of expert opinion. Unless the court orders otherwise,\nquestions calling for the opinion of an expert witness need not be\nhypothetical in form, and the witness may state his opinion and reasons\nwithout first specifying the data upon which it is based. Upon\ncross-examination, he may be required to specify the data and other\ncriteria supporting the opinion.\n