I think, it is time for all countries to adapt digitized passport to tract one's travel. Most people will object simply for privacy and freedom. But we are not in the universe of the founding Fathers. Innocent lives need not be wasted because of ideology and/or religion. Reality has changed since 1776. Freedom is not free in our times. We evolve to a social being.
For body search, ultrasound works well on non-metal substances inside and outside the human body. Submarine deploys this technology to navigate the ocean floors and avert dangerous objects in the waters. This technology is available and needs minimal capital investments for further refinements for above uses.
No need for profiling.
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