Hmmm... actually touching the ground? Not yet, and probably no still pic actually shows that.
This pic from USA Today ? may comes as close as I have seen...
SB Nation
Stephen White
1/15/15
And if you go to this
National Post, you can stop/start the video.
National Post
Cam Cole
1/12/15
Here is a freeze-frame showing the loose ball while Bryant is rolling into the end zone.
So the Ref standing just outside the end zone had essentially perfect positioning
to see the ball, the ground, and the lack of ball control. And if lack of control is what the "Rule" is about...