If there's a perforation in the 4th stomach of a cow, the kohanim were accustomed to treat it as permitted. Which leads to lots of discussion and tracing back. With a mnemonic about the blessing of the kohanim. And that blessing pertaining specifically to the meat. Also, the implications of the forbidden fat -- in contrast to the permitted fat. Plus, what if the impetus to be lenient puts others at risk, for example? Also, unguarded honey, and the possible kashrut issues, as compared to a risk in ancient honey..