Dr. Amos Dudayev is a Ukranian allergist in New York City with a side service of offering medically unwarranted castrations of men who want to pay for the operations. Under the basic laws of consent of performance by a professional with a medical degree no matter the qualifications, Dr. Dudayev's practices were legal no matter how scrutinized since they were from his private business.
When serial kidnapper and rapist Horace Gorman was castrated, detectives briefly considered when it was consented amputation gone wrong and found Dudayev. He was questioned and proudly boasted his business, but he had no contact with Gorman, clearing him as a suspect. (SVU: "Control")