I think goal line tech is a lot more difficult to implement in hockey, you could put a sensor in a puck easy enough, but you'd have to hollow out the puck which would almost certainly change it's dynamic properties. Soccer uses a camera method with over a dozen dedicated camera's all over the pitch (at a cost of $260K install and $4k per game), but that may be a lot harder to implement in hockey as the puck is so much smaller and the goal creases tend to be so much more crowded.
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