Pakistan has not signed the NPT. Pakistan has signed no legal document which states it will not sell nuclear technology. Pakistan has broken no law internationally or domestically in Pakistan.
If there no law is broken, there is no crime. If there is no crime, the man is innocent. and Dr. AQ Khan is a national hero. Regardless of what you expat-Pakistanis think.
You are justify selling nuke tec to unstable nations which no question makes the world a much dangerous place because Pakistan hadn't signed a document? This logic is mind numbingly short sighted and narrow. I will kindly describe Pakistan as being in a period of 'rough transition' and bright spots can be hard to find, but to classifying the corrupt Khan as a national hero is pathetic. Don't let nationalism trump humanity.