The Daylycaller, a reliable US publication, published an article about Digital devices and miscarriages of justice. The article here
Basically there are many things that is still being developed regarding the science of electronic device forensics, there are also physical factors, for example being able to prove that a specific person was operating whichever device at a specific time.
What is interesting about the article is the reference to unused, empty or deleted space on any storage medium. Next time you borrow a memory stick or buy a second hand hard drive, notebook, mobile smartphone or other device be careful of dealing with Nigerian 419 scammers or paedophiles. You may end up paying the price for their crimes…