The Supreme Court upheld the California law that requires pig "farmers" provide enough space for each pig that it can "lie down and turn around in spaces in which they are housed." Mainstream news coverage
here, more in-depth analysis is
here, and the actual court opinion, concurrences and dissents can be found
here.
Short summary is that California gets to put constraints on animal welfare for animals sold to California consumers. What remains to be seen is whether pork producers will walk away from the CA market, have separate systems for pigs they're going to sell to CA consumers and the rest of the country, or just ensure that all of their pigs meet the CA standards. What also remains to be seen, though of less direct concern to this board, is what else California can do to leverage the state's outsized purchasing power on producers and suppliers of other goods and services.