I don't get it. Anyone wearing a magic band has a unique identifier with long range tracking capability. If they hang sensors around the park they already know where each person is and who that person is with their location in the park at any given time.
I think this is just an effort to cover all their bases but my first thought was that they should use an odor sample if that is what this does, we are all unique in that regard, just ask any dog you know.
But seeing as we already have electronic noses maybe they wanted a patent all their own.