North Korea Tested Chemical Weapons?

GW North Korea is a George Washington University student site that cites here to a New Zealand site reporting the

North Korea conducted lethal chemical experiments on humans until 2002 as part of a programme to develop weapons of mass destruction, a human rights group said yesterday, quoting former scientists from the communist state.
Rabbi Abraham Cooper of the Simon Wiesenthal Centre said the scientists gave first-person testimony describing gassing of political prisoners in the North from the 1970s until 2002.

The GW students are properly skeptical of the source, but also properly concerned about the ramifications if true.