14 CFR § 437.61 - Landing and impact locations.
For a nominal or any contingency abort landing of a reusable suborbital rocket, or for any nominal or contingency impact or landing of a component of that rocket, a permittee must use a location that -
(a) Is big enough to contain an impact, including debris dispersion upon impact; and
(b) At the time of landing or impact, does not contain any members of the public.
The following state regulations pages link to this page.