systems using identical technology on the Mexican border with Texas and the Canadian border with New York, in part because the frequency of attempted illegal border crossings in these places is so different.

  • System performance characteristics may vary by major population subgroups and by the types of challenges presented to the system. Extrapolation of technological or system performance characteristics across settings or challenges—for example, from (1) laptop access control to auto theft control to border control or (2) from illegal immigrants to narcotics smugglers to terrorists—is unlikely to be reliable.

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