A few years back, I was providing tech support for an elementary school in Mexico. The teachers and staff were not particularly tech savvy. The problems I got called in for included even basics such as formatting Word documents or troubleshooting Internet connections.
One day fairly late, I received a call that the printer in a classroom would not work, no matter what they tried.
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By the time I showed up, all the students and most staff were gone, including the teacher whose classroom housed the troublesome printer. Another teacher showed me which printer was causing problems and which computer was hooked up to it.
I started by trying to print some test documents -- with no luck. But very soon, I found the real problem: The printer application was stuck with several documents in the queue. For the sake of decency, I shall omit the real names of the documents. Let's just say there were about 15 pictures of "hot Latinas" waiting to print.
I asked the teacher about the owner of the computer. He said that the teacher in the classroom usually stayed after hours, working late.
The stuck printer queue was the first clue I had of the teacher's after-hours activities. I quickly fixed the printer problem, then started building a report about what the teacher was looking at, including the time of day. The cookies and cache revealed a lot of inappropriate websites he visited on an almost daily basis after school hours. Then I submitted the report, including screenshots and timestamps, to the principal.
A few days later, I learned that the teacher was confronted with the hard evidence and denied all accusations, despite the fact that he was the only one at the school at times that coincided with the timestamps. I was summoned to reproduce the results of my report.