The Economist http://econ.st/tyzwbn

One could have thought that the old legal rule against double jeopardy would be strengthened as new surveillance technologies (ID papers, computerized databases, and DNA) made prosecution and condemnation easier and less costly. One would have been wrong as the demise of double jeopardy in English law shows. What happens in reality is that the lower the cost of power for Leviathan, the more power he wants. What the demise of double jeopardy means is that the state is certain to get a conviction when it really wants it, whether its victim is guilty or not: with its nearly infinite resources, it will just have to prosecute as many times as necessary before a jury caves in.