Years ago, when I worked for a company that installed phone systems, we had service techs out on the road all the time. About half of our customers were covered either under warranty or with a service contract, the remaining half paid for their service calls.
One of the non-covered customers called in and complained about the 3 hour service call (plus one hour destination charge). The tech had never come out to site, just called and cleared a very minor problem over the phone. So they started going through that tech's paperwork. It seems that he just LOVED working on systems that were covered by some kind of service contract. He would get into the service department first thing and pick out calls (if at all possible) that were covered. Then, he would call the customer and see if it was a minor problem that could be cleared over the phone (like powering down and rebooting the power supply). If he was lucky, he then had half a day to do what he wanted. The company determined this by doing followup calls on some of the jobs that were covered by contract, and found that about half of the time he never appeared at the site that he said he was at.
So where was he? Well, he was also turning in his phone bills to be reimbursed for business calls he was making while working (this was before the day of common use of cell phones). It seems he was spending time at a bar, using the payphone, charging the call to his home phone. He would make his phone calls, until he had blocked out a week's worth of open afternoons (it did seem that he actually did work before noon).
If he hadn't made the mistake with the one service call (misread warranty status), and more especially, if he hadn't turned over his phone records to the company to reimburse him, he would not have been fired.