Earlier this summer, in writing about reference information for bad employees (I call them "the Axis of Evil"), I mentioned employment investigations, noting that this was a topic for another post. Well, today is the day. Now that the Supreme Court has officially recognized "cat's paw" liability for employers whose decisions are tainted by an individual with an unlawful motive, it is more important than ever for employers to conduct workplace investigations that are above reproach.

And because it's more fun to talk about mistakes than what people do well, I'm going to focus on five workplace investigation errors that I see regularly.