The contrast between the winner of the men's event and Naser at the end of their respective races was striking. Gardiner was gassed and lay on the track to recover; Naser showed no real signs of fatigue. Dubious.
Miller-Uibo didn't seem that gassed either.
Being tired or not at the end of a race is not evidence of doping. Dopers have run to exhaustion, clean athletes finish looking good.
This is absolutely visible at the junior sport also. Some kids finish and run around excited, others are dead on the ground.
The adrenaline of winning a world championships does a lot to hide fatigue. Miller-Uibo probably pretended she wasn't that tired as she messed that race up big time.