Which signs should make me stop?
Stop interacting if you notice in particular: a recruiter asks to use your personal account to move money around, you have to withdraw, convert or quickly send on money received from a stranger, the task is vague but the pay seems immediate and high. A known visual identity never makes up for an unusual request.
Does the detector replace an official check?
No. The detector helps you understand the risk and the signs you have noticed. For a banking, administrative or account-related operation, always confirm with the official service through an independent channel.