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Theres no metal detector or security screening that can single it out.
Alas, there is a covid test that we can run, some instant, much better than a metal detector. We can test for symptoms, temp check (closer to a metal detector), wear masks. There is nothing we can do to 100% prevent terrorism, maybe report unclaimed bags etc. but nothing as "effective" as a mask. The analogy falls apart rather quickly. plus soon we might have a vaccine , show me the vaccine for terrorism.
Also bemoaning attendants losing jobs and then in same breath saying shut down everything. Puzzling.