Days before the 2019 World Aquatics Championships, Australian sprint swimmer Shayna Jack abruptly withdrew, citing personal reasons. The real explanation emerged afterward: an Australian Sports Anti-Doping Authority out-of-competition test had detected ligandrol, also known as LGD-4033, a prohibited anabolic agent associated with bodybuilding and muscle growth. A follow-up sample confirmed the finding, prompting Swimming Australia to suspend Jack while ASADA investigated. Jack repeatedly maintained that she had never knowingly taken a banned substance, saying that intentional doping would disrespect her sport and jeopardize the Olympic career she had pursued since childhood. The case became especially consequential because ligandrol was not merely a technical rule violation; it was an anabolic agent capable of triggering a lengthy sanction even when an athlete disputed deliberate use. The Court of Arbitration for Sport ultimately concluded that the ingestion was unintentional but imposed a full 24-month period of ineligibility, running from 12 July 2019 through 11 July 2021. After Jack had served the entire ban, Sport Integrity Australia challenged the outcome, but in September 2021 CAS upheld the suspension as completed and cleared her to return. Jack came back to elite competition in 2022, won major relay medals at the World Championships and Commonwealth Games, and later helped Australia win Olympic relay gold in Paris in 2024. The episode remained a defining and controversial interruption in her career: she was sanctioned for the presence of a banned substance, yet the official resolution rejected the notion that she had intentionally doped.
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