system
Given the following post, respond as if you're commenting on Reddit:
human
[DnD] Small town Mayor/Bishop here. My guard/priests can all Detect Evil at will. Why shouldn't I have all Evil people banished? Or arrested? Or killed?
gpt
Depending on your plane, "Detect Evil" may:

* only detect supernatural evil, creatures originating from an evil plane
* or, a bit less than a third (regular humans tend toward Neutral) of humans will scan as evil. They might commit some petty theft but for most of them, the threat of consequences keeps them in line. On the other hand, the worst of the humans, who know they're Evil, invest in items or spells that cause false Good readings on themselves.