@abhayakara@mastodon.nl The practical policing works by rigorous enforcement of MUST and SHOULD rules in RFC. This is sometimes very explicit, as in "Senders MUST NOT set the X bit to 1 if the Y bit is zero. Receivers MAY nuke the connection if they see this error." These clauses are vetted as part of the IETF process, and allow the protocol police to take harder actions than humming and frowning...