The DNA-profile of one individual is identical in each part of the body. It does not make a difference in a comparison if a DNA-profile of an individual is based on hairs, blood, swabs, semen or tissue.

 Because large variation is present in the DNA, it is almost not possible that two randomly selected individuals have identical DNA-profiles. Each individual will have his or her own DNA, which will differ on one or more points from other individuals. One exception on this are identical twins or clones, which have completely identical DNA patterns.