The series closes with its verdict: the fiscal case for buying upstream usually fails, but a country that has decided to catch people need only decide when. From the 1601 poor rate to the 1986 emergency-care mandate, no commitment to catch people has been repealed. The episode states a limiting principle, that an intervention must act on the hazard and not the person, and tests it against Buck v. Bell and hard modern cases.
The hazard principle is claimed only as necessary, not sufficient, and vaccination shows it does not settle how hard a state may push. Whether Buck v. Bell would survive modern doctrine is unanswered, and prescribed fire's net health effect remains unsettled in print.


