The policeman has said that it's inconceivable that Green had not viewed the porn. I take it from that that the stuff wasn't particularly hiding behind hard passwords, etc. If Green knew that the porn was there but that someone else had installed it, he would have done what the rest of us would have done in the same circumstances: made a bloody great big stink about it. Which he didn't do. What if I'd found porn on my school laptop, did nothing about it and then had it discovered by the head? I'd be sacked, that's what.