Mealey's (October 13, 2021, 1:02 PM EDT) -- TULSA, Okla. — An expert who opines that an Oklahoma police officer’s operation of a pepper spray gun violated the department’s use of force policies and the manufacturer’s instructions may testify after the department’s sheriff failed to prove that the expert fell short of the requirements set under Daubert v. Merrell Dow Pharmaceuticals Inc., a federal judge ruled Oct. 8....