Certify became the first of the Godolphin 22 to return from a steroid ban and win when taking the Group Two Cape Verdi at Meydan.
The unbeaten filly, winner of the Group One Fillies' Mile and conqueror of the subsequent 1,000 Guineas winner Sky Lantern at two, was a leading fancy for that Classic until ruled out by the Mahmood al-Zarooni doping scandal.
Improvement was scarcely necessary in this comeback, as the French 1,000 Guineas winner Flotilla ran poorly.
Certify's trainer, Charlie Appleby, said: "We had high hopes for her as a three-year-old and, hopefully, she's got a lovely career ahead of her."
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