Addon which shows Rogues while in stealth?

Hi guys,
One of my friend told me that some people use an addon which shows Rogues on map while even they are in stealth. Could this be true? Because a few times while I am playing with my rogue, some people attacked me while i am in stealth mode. If there is a such thing then stealth could be useless. Before ı invest much on Rogue, I wanted to learn this.
Thanks in advance

Salim

idk bout cata, but for wotlk there sure as hell isn't one.
It's either hunter's track hidden, hunter's mark or some cheat.