Luke Skywalker would be another example.
Lolwut? Jedi are epitome of "lawful".
Generally speaking it's always been a fairly shit idea though; mechanically it does a bunch of unfun and world breaking shit with spells that can detect evil. Detect truth has the same problem really. In a world where you can't get away with deception, you've basically gutted a huge number of potential character archetypes. Who the fuck is going to join team bad guy when anyone worth their salt can spot you easily and you're KOS as a result?
That was addressed just a few days ago in a different thread:
Magic proliferation goes both ways. That's why you also don't get to cast Charm Person left and right to make kings and fair maidens do your bidding. Everyone gets the Amulet against player characters who think they're clever +3 as a gift on their first name day.
The first thing someone does after someone else invents a spell to detect truth, is inventing a spell that allows lying through your teeth undetected.