“I’ve never seen a case like this, and we’re talking about 30 years I’ve been doing this kind of work,” said Don Catlin, an antidoping expert and former director of the U.C.L.A. Olympic Analytical Laboratory. “I’ve had doublets and triplets, but to have five, and have it cover three different subclasses of drugs, is unique, as far as I can tell.”
Richardson tested positive for three anabolic steroids — Methandienone, Methenelone and Trenbolone — that are fairly commonplace on their own, according to doping experts, but unusual in tandem.
On top of those, he tested positive for Letrozole, a drug that blocks the enzyme responsible for the production of estrogen, a process that commonly occurs as a byproduct of anabolic steroid use and is linked to several undesirable side effects.
Finally, Richardson also tested positive for amphetamines, which have been banned in baseball since 2006. Prescription medications like Adderall and Ritalin, which are used to treat attention deficit disorder, can cause a positive test for amphetamines, although it was not clear what drug Richardson had in his system.