In a major blow to the athletics world, Ruth Chepngetich, the women’s marathon world record holder, has been provisionally suspended after testing positive for a banned substance. The Athletics Integrity Unit (AIU) made the announcement on Thursday, July 17, sending ripples across the global running community.The 30-year-old Kenyan runner, who has been hailed as one of the most dominant figures in long-distance running, now finds her illustrious career under intense scrutiny.What Is the Drug Behind the Ban?Chepngetich tested positive for hydrochlorothiazide (HCTZ), a diuretic commonly used in medicine to treat conditions such as high blood pressure and fluid retention. While HCTZ is not a performance-enhancing drug, it is classified as a prohibited substance by the World Anti-Doping Agency (WADA) due to its potential use as a masking agent.HCTZ increases urine output, which can dilute the concentration of other substances in the urine, including performance-enhancing drugs, making them harder to detect. This is why it remains under strict monitoring in competitive sports.Chepngetich’s sample, collected on March 14, 2025, reportedly showed an HCTZ concentration of 3,800 nanograms per millilitre, dramatically higher than the WADA threshold of 20 ng/mL. This has raised immediate red flags for potential misuse.Under ScrutinyBefore this suspension, Ruth Chepngetich’s career had been nothing short of phenomenal. She captured global attention in October 2024 when she smashed the women’s marathon world record at the Chicago Marathon, clocking in at 2:09:56, nearly two minutes faster than the previous record held by Ethiopia’s Tigst Assefa. It was her third Chicago Marathon victory, reinforcing her status as a marathon titan.Chepngetich’s reputation was also built on her grit, especially visible during her gold medal win at the 2019 World Championships in Doha, where she overcame brutal midnight heat to win the marathon. These performances had elevated her to the status of a national icon in Kenya, a country with a rich tradition in long-distance running.However, the doping revelation now casts a shadow over those accomplishments and has triggered broader concerns about doping in elite marathons.Investigation Timeline and Next StepsAccording to the AIU, Chepngetich was notified of her positive result on April 3, 2025. While she wasn’t immediately banned, she voluntarily accepted a provisional suspension on April 19 as the investigation began.“Chepngetich was not provisionally suspended by the AIU at the time of notification; however, on 19 April, she opted for a voluntary provisional suspension while the AIU’s investigation was ongoing,” said Brett Clothier, Head of the AIU.On July 17, the AIU formally issued a Notice of Charge and imposed its own provisional suspension, pending further action.Chepngetich now has the right to challenge the findings and present her defense before a Disciplinary Tribunal. If the charges are upheld, she could face a ban of up to two years, depending on whether the tribunal finds aggravating circumstances or any prior infractions.While Chepngetich’s case is still under review, it adds to a troubling pattern that could shake public trust in elite sports. Her legacy — once built on speed, stamina, and triumph — now hangs in the balance.