William Dunn (strength and conditioning coach for the University of Virginia and major steroid and painkiller user) got busted doctor shopping and tried to get a lighter sentence by giving up the name of one doctor who he knew was dealing drugs - George Zahorian. After Congress passed the Anti-Substance Abuse Act of 1988 the FBI started paying a lot more attention to steroid dealing, so they subpoenaed Zahorian's FedEx records and found frequent shipments to Vince, Hogan, Piper and other WWF wrestlers - some to hotels in cities the WWF was traveling to and some at Titan Tower. Dunn also started wearing a wire when he bought from Zahorian and eventually the feds raided his office, finding the doctor in the act of shredding receipts with Piper's and Lord Al Hayes's name on them. From there they started building a case against Zahorian and that led them to start investigating Vince.