system
Given the following post, respond as if you're commenting on Reddit:
human
[Batman] Batman's whole schtick is scaring the shit out of bad guys, has he ever used Scarecrow's gas to do so?

Obviously scarecrow is an asshole, but his gas seems promising.  It's non-lethal (Except in the cases where he's overclocked it and driven people crazy), it suits the Bat's M.O., and he should be perfectly capable of reverse engineering it and making a slightly weaker form that won't make people hyperviolent lunatics.  He could incapacitate criminals without breaking half their bones, and I doubt they'd risk a return visit from Zombie-Demon-Batman (They might think they could take regular Batman in a rematch, I doubt they'd try it if they thoight he was a magical demon who brought their nightmares to life.).

Has he ever used Scarecrow-style gas when he wasn't already fighting Scarecrow?  I.e, has he ever set out with the goal of using it, rather than just turning it around on Scarecrow (in the canons where SC isn't already immune to it, anyway.)?
gpt
Scarecrow's gas makes people unpredictable. If you break their arm, you can be pretty sure how they're going to react. If you dose them with a mild-altering substance you have no idea what's going to happen.

On top of that, Batman uses fear as a selective tactical weapon. Spraying a gas around will affect innocent bystanders.