secretly

PC Jason Sinclair-Birt was dismissed on 24 October after being secretly filmed "boasting about and revelling in the use of force" on a detainee.

A short time after the White House released the news, communications director Steven Cheung accused correspondents of “secretly recording” conversations in the West Wing.

Recruited into Soviet intelligence, he spent several years living undercover in Norway, posing as an electronics salesman while secretly setting up radio networks for fellow spies.

A man at the centre of an organised crime network has been secretly filmed telling BBC undercover reporters how he can help to erase fines of up to £60,000 for employing illegal workers.

A placebo cream was used on some areas, but scientists secretly lowered the temperature to convince participants that the cream was reducing pain.