As a practical matter, they are inaccessible. Nobody lives out there. There is nobody to arrest them. The ones that aren't remotely located are assimilated. In

As a practical matter, they are inaccessible. Nobody lives out there. There is nobody to arrest them. The ones that aren't remotely located are assimilated. In short, to View this as a 'zoo' or something similar to Star Trek-Ian Prime Directive stuff (where we observe but don't interfere) isn't entirely accurate: these places where they live cannot be reached... the rainforest is HUGE and difficult to traverse.