Steelers TD 2 Feet Down?

[docicu3]

Originally Posted by Danzig

it was a touchdown. i don't understand why, if his feet were in the endzone, that it matters where the ball is at? if you're on the sideline and drag both feet, the catch is in bounds, regardless of where the ball is located. also, forward progress, his feet were in the endzone.

A touchdown is defined by any part of the BALL crossing the goal line....or


Touchdown: When any part of the ball, legally in possession of a player inbounds, breaks the plane of the opponent’s goal line, provided it is not a touchback.

What I don't understand at this point is why they don't use a laser of some sort to validate "ball over line"....