just use one of those innocuous bags or envelopes that hard drives and PC boards come in. They block the signals pretty well since they block static electricity, they'll block the signal as well. Unless the "cruiser" uses a signal strong enough to penetrate, which would mean that it would probably be detrimental to the person holding the passport, too, it might give them away. (As if the giant power supply wouldn't.)
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just use one of those innocuous bags or envelopes that hard drives and PC boards come in. They block the signals pretty well since they block static electricity, they'll block the signal as well. Unless the "cruiser" uses a signal strong enough to penetrate, which would mean that it would probably be detrimental to the person holding the passport, too, it might give them away. (As if the giant power supply wouldn't.)