Fingerprint scanning is real—but for identity verification , not truth detection. For example:
| Red Flag | Why It’s Dangerous | | :--- | :--- | | | They are stealing your biometric identity. | | Requires downloading an app or extension | Likely malware or adware. | | Asks for your name and birthdate | Data mining for identity theft. | | Shows pop-up ads during the “test” | They make money per click, not per truth. | | Uses Comic Sans or flashing text | Unprofessional; indicates a prank site. |
There is no scientific technology that can determine if a person is lying simply by scanning a fingerprint on a smartphone or computer screen. How These "Tests" Work