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It's a rfi chip. All it does is spit out a data string in response to a query. Yes it can be used anywhere the data string is read.
I had an " everywhere" pass card for doors at work because my job required access to all parts of the facility. The pass card generally worked everywhere I tried it including the local police office and the hospital pharmacy.
Side comment: authorities get VERY upset when you find a breach in their security. True in 1972, more true today.
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casual notes from the underground:There are some "experts" out there that in reality don't have a clue as to what they are doing.
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