In 2015, the Legislature passed Senate Bill 5433 modifying the original 2005 legislation, now requiring the Since Time Immemorial: Tribal Sovereignty in Washington state or other tribally-developed curriculum be taught in all schools.  In 2024, the Legislature passed House Bill 1879 naming the curriculum in honor of John McCoy (lulilaš).

The use of the John McCoy (lulilaš) Since Time Immemorial curriculum has been endorsed by all 29 federally recognized tribes.