Had a similar kind of incident, although customer didn't blame me for it.

Customer was good friend of family and had set up a computer for the kid to do "homework" on. Installed AOL (against my better judgement, but hey, they're the customer) About a week later was talking to customer when dad commented they were getting a lot of porn mail (spam). Told him I would check it out.

Parents had set up a supervisor accounts in AOL and also set up accounts for son (15) and daughter (6!). Son's email, however was getting a large amount of porn mail. Turns out son had hacked parents supervisor password (it was real easy to figure out) and had changed his user profile to show he was a 22-year-old. (Kid admitted it to me!!)

I also pulled up internet history (Parents or kid didn't know about that) and show a trail of porn sites in kids & DAD's account.

Needless to say, mom was not happy and shut off internet access to whole family.

Point is, document what happens and prove it to customer. Unless customer is smart enough to cover tracks (most aren't), you usually have tools to prove case.

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I keep hitting escape...Why am I still here??