Ultimately all of the law is simply the threatened use of force; "Come with us, or suffer the consequences." In this case, they simply don't bother with nonlethal force (barring vampire police officers, which is entirely possible if Bella's working with the government), and go straight to "If you resist arrest, we'll kill you."
I wouldn't be at all surprised if it was entirely possible to construct a prison capable of holding a vampire, either; it'd just take a lot more resources than any individual vampire is likely to possess. Their strength is finite, after all; sufficiently thick steel will be capable of resisting their blows, so a sufficiently durable metal cube with a trough underneath a pipe in the roof (to hold animal blood for them to eat) should be more than capable of holding one more or less indefinitely.
If you pause to make that threat to a vampire, it can probably kill you or escape. They move too quickly for humans to handle. If it can't actually escape, it can probably get a hostage or three so if you set it on fire or attack it with sufficient blunt trauma, an innocent human dies. If the only people around are the folks holding the burny weapons, and those weapons have enough range that the vampire can't get away from where they'll shoot within the human's reaction time (i.e. if you have a circle with a radius of a football field or more ready to g...
In the vein of the Harry Potter and the Methods of Rationality discussion threads this is the place to discuss anything relating to Alicorn's Twilight fanfic Luminosity. The fanfic is also archived on Alicorn's own website <strike>(warning: white text on black background)</strike>.
Previous discussion is hidden so deeply within the first Methods of Rationality thread that it's difficult to find even if you already know it exists.
Similar to how Eliezer's fanfic popularizes material from his sequences Alicorn is using the insights from her Luminosity sequence.
Spoilers for the fanfic itself as well as the original novels need and should not be hidden, but spoiler protection still applies for any other works of fiction, except for Harry Potter and the Methods of Rationality chapters more than a week old so we can freely discuss similarities and differences.
EDIT: Post-ginormous-spoiler discussion should go to the second thread. (If you have any doubt on whether you have reached the spoiler in question you have not.)