Hitman: Absolution - One With the Shadows & Sandman Trophy / Achievement Guide
16When an enemy goes red on the mini-map, that means you have there attention and are hostile. All you need to do is lose them. This can be done in a few ways, but the best way is on the mission "The King of Chinatown" go down to where the alleyway to the sports car begins then up the small set of stairs. There is a cop who will always be standing there with the crowd and he has his back to you, subdue him with (Sandman Unlocked). You should now see a picture of 47 in his suit in the bottom left corner. Now quickly go down the sports car alley and shoot the cop there and change into his uniform. Just casually walk off from the scene then until you reach the other side of the map. You can interact with a menu if you want to hide, but it's not required. The trophy / achievement will unlock when everything returns to normal.