"Go to a quiet room. No background noise. No one else can be present."
And here's where the mask slipped. The repeated, insistent demand that sealed it for me.
Sir, for the confidentiality of this investigation, you must move to a quiet, private location. There should be no background noise and no third party present. This is a matter of national security and must remain strictly confidential.
Are you alone now? I can hear something in the background. Please ensure complete privacy before we proceed.
And THERE it is. They don't want me to be "confidential" — they want me isolated. No one to say "hey, this sounds like a scam." No witness. No reality check. Game over.
THE BIGGEST RED FLAG: Demanding isolation. Scammers need you alone so no friend, family member, or colleague can break the spell. Any "official" demanding you can't tell anyone is almost certainly a scammer.