Check out this interesting article in the WaPo about the increasing numbers of unsolved murders, despite drastically improved technology. The article makes the point that despite improved forensics, DNA testing, etc., more and more cases go unsolved each year. According to the article, the reason is that the nature of murders has changed over the last forty years, with gang violence accounting for much of the problem. Gang murders, which often involve drive-bys, little to no relation between the victim and suspect, and witness intimidation, are much harder to solve than the old fashioned murders. Interesting stuff.