system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Trek] Why are cloaking devices illegal under Bajoran law?

Presumably Bajor wasn't party to the treaty between the Feds and the Romulans...
gpt
Bajor just came out of an occupation, economy is wrecked, blighted land everywhere, law enforcement is stretched thin, and radical factions trying to perform coup d'etat, with Cardassian supplies no less.

So what would people do with cloaking device? they would smuggle stuff, bring in contraband, aid in kidnappings/piracy, and possibly try to use it to perform coups. Hence why it is banned, it is not like Bajor has a military to speak of that can make use of cloaking device.