The following two links explain how the FBI's spyware was able to capture a bomb hoaxster.
http://arstechnica.com/news.ars/post...-hoaxster.html
http://www.wired.com/politics/law/ne...?currentPage=1
An interesting side note of the story is the companies producing anti-spyware.
http://news.com.com/Will+security+fi...3-6197020.html
The companies were also asked is they had a government or court order to not scan for police-malware - most said no. McAfee and Microsoft refused to answer the question.
This information was posted on
http://cyberpunkreview.com/ a pretty cool tech and movie site.