system
Given the following post, respond as if you're commenting on Reddit:
human
[Green Lantern/DC] What does the “no lethal force” law actually stop?

Prior to the Sinestro Corps War, there was a law in the Book of Oa that kept any GL from killing another being with their ring.

What would this actually cover? If you took your ring off and beat someone to death would that be stopped? What if you kept your ring on and just didn’t use it.

Would it stop you from torturing someone into insanity or putting someone into a coma?

What if you were wearing two rings and used the non-green one to kill, or if you had the Ion Entity and used it’s power, but we’re still wearing your GL ring?
gpt
As a Green Lantern, your ring/lantern sends periodic reports back to the Guardians about your conduct. If you break any of the big rules in the Book of Oa, it sends a priority report so that you can be recalled and dealt with, or possibly just teleports you directly to a holding cell on Oa. It doesn't matter if you use your ring to do something or not - if the ring notices you doing things that are against the Corps regulations, it'll snitch on you. And murder is very much against the regs.

As a Green Lantern, you're supposed to protect life and liberty within your sector; obey the Guardians; act in accordance with local law where possible; refrain from using force unless absolutely necessary and uphold the honour (read: reputation) of the Corps. There's exceptions for killing specific authorized enemies, but those are still logged and if the Guardians don't like how you did it, they will make their displeasure known.