Using the codis database in dna profiling is one of the best sources of physical evidence to identify the guilty party because a person's dna profile is unique to only that person and found in every cell of the body, some of which are often found at the scene of the crime the analysis of the dna is a very easy process and mistakes seldom occur the fbi and the courts have agreed to accept this evidence above all else in a conviction every type of crime is going to have dna evidence of some sort