It turns out that Green Lantern has his own way of compelling crooks to tell the truth:
And later, Alan Scott compels the criminal boss/police commissioner to confess--on the air!
The question of any of these compelled confessions standing up in court aside, this was clearly a case where the creators went a little too far with a hero's power. Why the heck couldn't Green Lantern wrap up every case in about 3 pages this way? So, fortunately, they backed away from it, creators only pulling it out when they were lazy or had painted themselves into a corner.
And most importantly, there's no way we could let Hal Jordan have a power like that, right? I shudder just to think about it!
From All-Star Comics #3 (1940)