A friend of mine has a startup. I introduce him to people at times, and he's got contacts who are useful to me too. When meeting up with such contacts, what precautions could we follow or how can we get to know if the new person we're meeting isn't doing something illegal or is into some unethical business? In short, how can we make sure we're meeting good people?
If I'm meeting someone completely new, who has no people known mutually common to us, how can I get to know this person is safe to do business with. Any tell-tale signs which should set alarm bells ringing??