Technology can be so easily misunderstood... especially with how crime involving new technology isn't treated like crime involving similar older technology.  One significant miscarriage of justice was a substitute who was prosecuted for showing pornography to a classroom of middle school students:

A substitute teacher in Norwich, Connecticut with no prior criminal record could get 40 years in prison for exposing a middle school class to pornography. She apparently was using the computer in front of students when a loop of pop-up ads for porn sites began to appear. The loops only intensified as she tried to close out the ads. The woman made the plausible defense that some sort of adware or malware on her computer caused the pop-up ads to appear. She also testified that she notified several teachers and administrators of the problem, and got no assistance.

Thankfully, she has been granted a retrial, so hopefully this miscarriage can be corrected (via Hit & Run).  As it turns out, after she was found guilty they went back and found that spyware was in fact on the computer.  What's interesting also is this case which was recently reported:

School officials say the students saw a few seconds of "hardcore" pornography yesterday after the taped lesson rolled past the credits.

Bedford County Schools spokesman Ryan Edwards calls the incident a fluke, and says school officials are blaming it on a video reproduction company.

Edwards says the screen went blank after the credits and ... quote ... "then, all of a sudden, to everyone's shock and dismay, hardcore porn appears on the television screen."

He says the teacher rushed to turn off the T-V, but students still saw a few seconds of the porn. The principal sent a letter home to parents explaining the situation.

School officials called the company - based in Arizona - and asked them to look into the matter and to alert any other customers.

For now, all Bedford County schools have pulled the videos made by the same company.

No criminal action taken, and in general a much more sane approach to handling the matter.  It would seem that the only real difference between the two cases is that one involved a computer, while another involved an older technology (a VCR) which everyone has a much better understanding of.