Arnold v. Sarn, a class action lawsuit that called for services for people with serious mental illness regardless of cost, celebrates its fortieth birthday this year. The litigation ended in 2014 with a settlement agreement that largely replaced “shall” with “may,” encouraging the system to try its best while softening requirements, and permanently doing away with a court monitor—the last remnant of robust accountability that had been in place for decades. Now Charles “Chick” Arnold, the lead plaintiff, says the agreement should have been more aggressive.