Cold Blooded doesn't help, the reticle still turns red and the TF buzzes when an enemy passes by. I know because I laugh when a CB user runs around thinking he's safe, only to eat those earth friendly rounds from my LSAT.
Cold Blooded does help. If you're running Cold Blooded and someone using TF targets you, the red diamond doesn't show up. Most of the complaints I've heard are about the red diamond. So even though the reticle turns red, you don't stand out nearly as much.
"ZOMG YOUR RADAR IS OUT LOLZ I SWEAR IM NOT 5 FT AWAY" - FFrulz2000 on Scrambler Perk Xbox Live Gamertag: Capatan Azn Man