If you’ve ever had or will have construction done at your home, I would bet good money that some members of the crew have done far worse than Freeze and have the paperwork to prove it. And you have no idea what some of the people you manage do in their spare time.
Edit-I am with you on a few points; would they steal from me or my customers, would they be a threat to coworkers in any way, ect. But I go with my gut on those things. But if they pass that smell test, my main concern is that they perform well for me. I don’t know what you would consider in terms of ethics and morality. But if one of my guys blows all of his paycheck in a strip bar after work, I could care less.