A viral video from Ghaziabad shows a police officer using a mobile phone-like device on a man's back, claiming it can determine his citizenship and suggesting he is Bangladeshi. The man stated he is from Bihar. Police sources indicated the incident occurred during a search operation for illegal immigrants. An ACP clarified it was a police interrogation, not a technical device, aimed at verifying facts. The video sparked online debate and memes questioning the method and existence of such technology.