A leaker is someone who lets people know secret information. [journalism] He found no direct evidence to identify a leaker.

What is a leak and why is it used?

A leak is a way (usually an opening) for fluid to escape a container or fluid-containing system, such as a tank or a ship’s hull, through which the contents of the container can escape or outside matter can enter the container.

How do plumbers detect leaks?

Acoustic listening devices. Ground microphones and listening discs are among the basic tools that plumbers use to pinpoint leaks. Using sound technology, they can hear the noise of escaping water and dripping even through a layer of concrete.