You can see their name when you look at them, you can see all blood stains on their body and even without those things they still have a blur. You also have to be holding it for it to work, so when you want to switch to a weapon you become visible again.
Phantom_2207 wrote:
-snip-
Slow motion is already getting added. The other suggestions look like bad idea's to me. We could use new maps and such, but no need for 3 traitor things (that won't be used anyway).