COOL! WOO! GTL in the NFL! WOO!

I was having a conversation with a colleague recently and we started talking about how its difficult to manually officiate whether the football crosses the plane/gets inside the pylon during NFL football games. A solution to this problem would be the use of GTL (Goaline Management Technology) which leverages the magnetic field technology currently applied in trial in FIFA soccer. Thin cables are put in the ground or wireless above the turf, installed on the goaline and they emit a unique magnetic field. A sensor in the ball would measure and send encrypted data to receivers in acomputer which determine when the ball has crossed the line, the referee would be appropriatly informed of the decision. This would all take a fraction of a second and seems like a reasonable and feasible solution to the much debated goal line calls.