What about prisons?

[Geoffers747]

Just to add to this, from another thread:

@Schmillt

With restricted areas, this brings up crime. So as your city grows it can attract crime such as thieves. Thieves will steal from stockpiles and granaries and whatnot. This means we have a real reason to set up guards on patrol. If a guard spots anyone in a restricted area that shouldn’t be there, they can be taken to dungeons or something. Patrolling guards look badass (especially with torches) and it will give us a real reason to think about the layout of the city and guard posts and all.

To which I replied:

@Geoffers747

Not sure how individual characters will work, but if they have an inventory the guard could ‘check’ the inventory, if they have stolen goods → jail, if just in restricted area, escort them out.