The problem with baddies is that smoke and doors and all the other things David Copperfield uses makes them hard to see. And if they have guns, that is bad. Thank goodness, then, that Rainbow Six Vegas 2 has given you a fancy new tool to combat this.
It's a thermal scan from your best friend the intelligence officer, and is displayed in the mini-map in the top right of your screen. Enemies show up as red dots, or pink if they're a level above, and you can see all this in action in Eurogamer's exclusive Thermal Scan trailer.