In curling, they have sensors in the rocks and the hog-line. It can tell if the person let go of the rock before the rock touches the line. With some alterations and a bit more math, there is no reason why they could not have sensors in the goal line and the puck that would automatically turn on the goal light if the puck completely crosses the line. The sensors and math could easily account for all the variables of the puck orientation as it crosses the line. So simple and much better than visuals, nothing could obstruct the view.
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