Cooper v. Pay-N-Save Drugs, Inc., and Schultz v. Cheney School Dist. concerned the use of the unavoidable accident instruction by trial courts. The court held that the giving of the instruction was error in the Cooper case but not error in the Schultz case.
L. W. Houger,
Washington Case Law,
Torts—Unavoidable Accident Instruction,
Wash. L. & Rev.
Available at: https://digitalcommons.law.uw.edu/wlr/vol38/iss2/22