There was a substitute teacher in Connecticut who got railroaded by a school that ran no firewall, no malware protection. If you look up "Julie Amero", you will see the ultimate case of being railroaded in a case like this. Oy! (Her family's blog about the issue:
http://julieamer.blogspot.com/ )
From Over Lawyered
http://overlawyered.com/2008/11/julie-amero-case-ends/ November 22nd, 2008 at 2:54 pm
Julie Amero case ends
» by Walter Olson
A judge had overturned the conviction of the former Norwich, Ct. substitute teacher (Jul. 15, Mar. 14 and Jun. 10, 2007, etc.) over the episode in which her computer (almost certainly infected with unwanted malware) displayed a stream of dirty popup windows while her students were watching. To the amazement of many, prosecutors refused to drop the charges and moved to hold a second trial. Now Amero has agreed to resolve the episode by pleading down to a single misdemeanor charge of disorderly conduct, as opposed to the 40 years she could have gotten on the original charges. (Rick Green, “Misdemeanor Plea Ends Norwich P0rnography Case”, Hartford Courant, Nov. 22).
More: “What I’d like to see come of it is a computer forensics innocence project.” (Joe Windish, The Moderate Voice; see also Balko/Reason “Hit and Run”, Bill Jempty @ WizBang, Rick Green @ Courant followup).
Another good analysis of the case is on
http://www.myleftnutmeg.com/showDiary.do?diaryId=5793 (Though it is an older post)