If you want to get away with a crime just watch every episode of CSI.
They teach you lots of stuff
A) Pickup the shell casings from the gun before you leave
B) Wear a hair net
C) Wear shoes a 1 size too big.
D) Drive a different car other than your own (So the tire treads don't match)
E) Wear shoe covers
F) Wear Gloves and long a sleeve shirt and pants to cover up all skin So you don't leave skin flakes.
Damn, are you getting ready to commit a crime?