KENYA'S Sarah Chepchirchir has been hit with an eight-year ban after the former Tokyo Marathon winner was found to have violated anti-doping regulations for a second time, the Athletics Integrity Unit (AIU) said in a statement. Chepchirchir had returned an adverse analytical finding for testosterone, the AIU said. The sample was collected at the Bangsaen42 Chonburi Marathon in Thailand in November. The 39-year-old was previously banned for four years in 2019, backdated to April 11, 2018, because of abnormalities in her athlete blood passport. The latest ban will be backdated to December 22, 2023, and Chepchirchir's competition results from November…