How would various government actually respond to discovering someone (harmless) had superpowers?
Someone is discovered to have superpowers of some kind. Clear evidence is found that someone has lived for hundreds of years and not aged, or unedited video footage is found of them surviving a lethal accident, or they are seen teleporting or moving at insane speeds.
In some countries where the government can do whatever it wants without restrictions, the person would be presumably imprisoned and researched. But in countries where there are more legal safeguards (at least in theory) what happens if the person has no interest in explaining the situation and doesn't appear to be any danger? Can the government legally compel them to do anything? Are there mechanisms in place to allow them to break the law for research?