Setting the perhaps slightly misplaced racial paranoia aside, I can't imagine you will find too much sympathy for "a black man in the area who commits a crime" in so much that he is "now far more likely to be arrested than a White person who commits the same crime".

Do all criminals deserve some sort of equal "sporting chance" of getting away with it?

More seriously, I think samples given voluntarily (as opposed to taken after an arrest, for example) have to be destroyed much sooner? Otherwise I'd better behave myself...