The limits on the Third and Fourth Laws are not entirely clear in the novels.
Harry mentions an "unlicensed mind-fog" in SK, which suggests there's a legal way to do that spell, which is surprising as it seems pretty mind-effect-y. Harry's sleep spells to give rest to people suffering from mental attack (eg the lawyer in TC with White Court damage) are mentioned as "grey magic" but accepted/allowed by the Council. Also, communication-only telepathy spells seem to be OK (Harry and Elaine's is clearly something they'd agreed on beforehand, but the Merlin uses a mass telepathy spell in TC).
On the Third Law, sinker is right that there doesn't seem much difference between Molly's looking in Luccio's head in TC and the Senior Council's later checking for mental influence. I'd then suggest that this kind of thing isn't "Lawbreaker" against the Laws, but unless you're someone they REALLY trust (Senior Council, high-ranking Warden etc.) the Wardens will get after you.