Much better links
In principle I wouldn't be totally against a study like this so long as it was on a totally voluntary basis and.......DNA samples were only taken on a similar voluntary basis.
I'm very uneasy about the taking of DNA samples, particularly by the police. IIRC there was a proposal that the police should be able to take a sample, against your will, even if they simply stopped you in the street.
Think there could be a grave over reliance on DNA evidence as being some sort of 'silver bullet' that solves all crimes. Its also tempting for the police to simply trawl through DNA records rather than investigating a crime fully.
So overall I would say this is something to keep an eye on.