Sometimes I think my eyes play tricks on me. With the Target Finder I think the center cross still turns red on Cold Blooded users, they just don't have the red diamonds around them when targeted. Don't now if anyone else has noticed this and can confirm?
If I expect ato find a sniper on a long distance shot (with an AR) I scan the grass or area where I expect him to be. The dot in the middle and not the cross-hairs register him. Scanning with the cross-hairs alone is not enough. The dot must be on the sniper.
gotta admit the target finders are very OP. not complaining though because I use it on two of my classes too. I was getting fed up of other people killing me with it so I decided to join the crowd. Don't blame me for killing you with it, blame treyarch for putting it in the game.
It means that cold blooded provides a resistance to the Target Finder but not an immunity. ie, people won't see you as a diamond hopping across the map with a quick look down the scope, but if they target you directly the crosshair will still turn red.