A pair of twins in Germany have walked free despite there being conclusive DNA evidence that one of them stole millions of euros worth of jewelery from KaDeWe in Berlin. However since their DNA is so similar, it cannot be proven that either committed the crime individually.

German law stipulates that each criminal must be individually proven guilty. The problem in the case of the O. brothers is that their twin DNA is so similar that neither can be exclusively linked to the evidence using current methods of DNA analysis. So even though both have criminal records and may have committed the heist together, Hassan and Abbas O. have been set free.
Both brothers have stolidly refused to comment ever since their arrests on February 11. Since no further evidence has become available, police cannot detain the(m.

(Via kottke.org)