Kei Saito (齋藤慧, Saitō Kei) is a Japanese former short-track speed skater. At the 2018 Winter Olympics, Saito tested positive for acetazolamide and was provisionally suspended and withdrawn before competing. In 2019 he was issued with a reprimand as he "bore no significant and only a light degree of fault" and received no sanction.
Source: “Kei Saito”, English Wikipedia (CC BY-SA 4.0), excerpt