Using decoys armed with remote audio systems and aided by “arrest teams” and undercover officers, the Police Department, over three days last month, made 195 arrests and seized 55 vehicles in what police officials called Operation Losing Proposition.

An analysis of the arrest data provided by the police shows that the crackdown spanned all five boroughs, on dozens of street corners, in 28 precincts. …

The concept behind Operation Losing Proposition has been a staple of police work for decades. But this time, as it was carried out Jan. 12 through Jan. 14, Police Commissioner Raymond W. Kelly sought to have officers focus not on supply but on demand, by arresting the clients, or johns.

“It is not a sound policy,” said Audacia Ray, 31, director of the Red Umbrella Project, a nonprofit group that assists prostitutes, who believes the street trade will never fade. “I don’t think we’ll see a big drop in prostitution because of these arrests.”