The tuck rule was eliminated 4-5 years ago. It was a rule for about 2 years before the "famous" patriots v raiders game in 81 that the refs improperly used it, Brady had pumped for a throw but held the ball, after, he was tucking the ball and hit his left hand with it and lost control. That is a pure fumble and the refs screwed the raiders as badly as they did in the saints/rams game in '17.