Switzerland. The Republic and Canton of Neuchâtel. Neuchâtel. Downtown. Narcotics squad. "Narko" operation.Two police officer in plain-clothes checks for traffic of illegal substances (drugs). Plainclothes law enforcement is a method used by police. The policemen wear plainclothes or "ordinary clothes" instead of a uniform in order to avoid detection or identification as law enforcement agents. Police officers in plainclothes must identify themselves when using their police powers. 9.04.15 © 2015 Didier Ruef