When a server is checking an ID and the patron seems unusually nervous, looks away, fumbles with their wallet, or quickly tries to retract the ID, the server should:
Explanation
Nervous behavior — sweating, hesitating, attempting to retract the ID, presenting it face-down — are red flags for a fake or borrowed ID. The server should slow down, examine the ID under good light, check for tampering, and may ask casual confirming questions about the birthday or address. Genuine holders answer easily; underage borrowers stumble. Ignoring red flags (a, c) defeats the purpose of carding.
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