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Full playthrough, score 300k : http://youtu.be/z3UgfxnCgJc
As for tips for each target : #1 : Kill with explosive barel, shooting through the other cop (the one that calls Chris on the phone) #2 : Kill with explosion gasoline can, shooting through Kevin Jamar (the fatty with the cap) #3 : Explosif (hidden behind the car)
And to get the SWAT disguise you need to kill a lot of cops.