Kristian Rhein, a suspended veterinarian formerly based at Belmont Park, on Tuesday changed his plea to guilty on one felony count within the federal government's sprawling prosecution of an allegedly years-long conspiracy to dope racehorses. Speaking in open court, Rhein also directly implicated five others, most notably co-defendant Jason Servis, the now-barred trainer who was his regular client and allegedly administered performance-enhancing drugs [PEDs] on practically every Thoroughbred under his control. "I, along with Jason Servis, concealed the administration of SGF-1000 and clenbuterol from the owners by billing for other...