How does your judicial system (or lack thereof) work with foreigners?
Take this hypothetical situation for example.
A lone Peri (small, green humanoid with dragon fly wings) is seen hanging around the outskirts of a medium sized settlement in your territory. Peri have a reputation for being mischievous and tricky. Some minor thefts are noticed, and after a few days, they are caught stealing from a larder.
The Peri immediately runs. Peri are small and fast, at only a foot tall and brought up in dense forests, they are hard to catch, and if you do lay hands on it, it can administer an electric shock that can kill small creatures and stun larger creatures, but they can only do this once. Peri also rely on glamours and geas, using minor mind magic to illusion themselves and influence others to make choices that will benefit them, though it is easy to overcome if the target is paying attention.
Can your local law enforcement catch the Peri? Will they pursue if it gets away? What happens if they do catch it? How could this interaction change the way things operate in the future?