If you know what protected classes are, and understand that you shouldn't bring them up in any way, and only discuss them with candidates if they bring them up

If you know what protected classes are, and understand that you shouldn't bring them up in any way, and only discuss them with candidates if they bring them up first and within that context (e.g. if they mention their "spouse" you can talk about that but best to not ask anything about kids until/unless they bring it up first again), you've successfully avoided 99.9999% of all pre-hire lawsuits.