I liked the idea of checking temperatures until I sat in a "best practice" seminar for my company recently where they discussed temperature checking. A few interesting points:

- People can fool the thermometers, if they want to. For instance, employees didn't want to work so they sat in their car with the heat on high before getting their temperature tested.
- The IR guns are not that accurate. If you test the same person multiple times in a row you can very different results.
- One "best practice" that was presented is to have three IR thermometers at each checkpoint, so that you can test a person multiple times if they fail the first test. This sounds a lot like testing until you get the desired result.