A 1994 investigation on the Bell Regulations ("Libby Zion Law") to limit resident working hours and requiring physician supervision—and follow-up study prompted the New York State Department of Health to crack down on violating hospitals. He led an effort against tobacco advertising aimed at children, enacting a law banning cigarette vending machines and released a series of exposés and legal actions against tobacco advertising targeted at children—concluding that R. J. Reynolds Tobacco Company was engaged in "commercial child abuse"—which culminated in a 1997 Federal Trade Commission decision that ended the Joe Camel ads.