I don't know where some of you get your information or theories from. If you give up that easy you'll never succeed.
I was/am just trying to save you some headache and let you know what to expect, since my information and theories come directly from experience in these matters. I thought that the purpose of this thread was a appeal for help, sorry if I misjudged.
For someone who is not versed in evidence law you can quickly do the wrong thing and trash the whole case(if you are not brought up on charges yourself), if illegal procedures were taken.
Trust me...the best intentions can very easily backfire on you. Playing the hero is nice, just not the blind rage hero.
I hope that your friend at the ISP did not provide you with information on him, elsewise he is going to be in a pot if the right people find out.
Either way if it goes to court..some friendly advice:
make sure you have all the answers to the questions that will be asked of you(experience, way you obtained, etc), ready to answer because 99% of the time, everything is tightly scrutinized. Although you might get lucky, and it might not even touch that, guy might have a dumb lawyer, or he might plead out.