The phrase "a rogue policeman" is correct and usable in written English.
It can be used to describe a police officer who behaves in an unorthodox or illegal manner, often acting independently of the law or police protocols.
Example: "The investigation revealed that a rogue policeman had been involved in the corruption scandal, undermining the integrity of the entire department."
Alternatives: "a corrupt officer" or "a wayward cop".
The killer was a "rogue policeman", according to the MoD, although the Taliban claimed responsibility, Gordon Brown told MPs.
And it is indirectly the reason why a rogue policeman killed Taseer outside a trendy Islamabad café last Tuesday, plunging the country into a fresh torment.
A horrific incident last month in Helmand, in which a "rogue" policeman shot and killed five British army mentors and then fled to join (or rejoin) the Taliban shook trust in the partnership policy by which Nato sets such store.
I tracked down Gates by phone at J.F.K. on Friday after he had talked to the president and agreed to go to the White House for a symbolic beer with the man he labeled "a rogue policeman".
Dwight Holly is Hoover's top lieutenant and main enforcer; Wayne Tedrow junior is an ex-Las Vegas cop now cooking dope for Howard Hughes Don Crutchfieldd is a peeping-Tom and low-level operative for a private detective and a rogue policeman in Los Angeles.
Whether "Oscar Pérez" is indeed part of a coalition of like-minded "military employees, policemen and civilians" or just a rogue policeman is hard to say.
"I was close to becoming a policeman".
Five British soldiers were killed by a rogue Afghan policeman in November 2009.
One report relates how five British soldiers were shot dead and six injured by a rogue Afghan policeman last November.
In Britain growing anti-war sentiment was strengthened by the killing of five soldiers by a "rogue" Afghan policeman.
He was speaking shortly before the arrival at RAF Lyneham, in Wiltshire, of the bodies of six British troops, including five shot dead by a "rogue" Afghan policeman they were training.
