Where is the police chopper in transformers autobots

finish defeating starscream in the arctic and after that you will go to tranquility for the second time make sure you have scanned at least 20 vehcles then get your wanted lvl to 2 and police choppers will come after you.to scan the cop chopper climb up a building aim the scanner at the chopper and ta-da! also its easier if you use an ordanary chopper(the one from the arctic) and go on to the building and scan!. (I found out this out by doing this on my game)