Stevens was the 2017 national champ over 200 and a former NCAA champion in the 4×400 relay running for the University of Oregon.
On one occasion her phone lacked battery power overnight, and another time she altered the number to avoid harassment from an unidentified person, the judgment mentioned.
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A 200-meter expert, Stevens put seventh in the last at the 2016 Rio de Janeiro Olympics, and 5th at the 2017 world champions in London.
Olympic finalist sprinter Deajah Stevens was banned for 18 months on Thursday for missing doping tests and will miss out on the Tokyo Games.
Stevens cited issues with her telephone as the reason sample collections officials were unable to contact her for two of the missed out on gos to, according to the released ruling from her disciplinary hearing.
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Stevens can appeal the ban at the Court of Arbitration for Sport.
The Athletics Integrity Unit, which prosecutes cases in track and field, said Stevens was unavailable for three doping controls in 2019 in Oregon and West Hollywood. Three offenses within one year can lead to a ban.
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The 25-year-old American runners restriction was backdated to begin on Feb. 17, 2020. It will expire days after the arranged closing event of the postponed Tokyo Olympics in August 2021.
