Mealey's (April 17, 2019, 11:27 AM EDT) -- NORMAN, Okla. — In an effort to keep a May 28 trial against two major opioid manufacturers on track, the Oklahoma attorney general on April 4 voluntarily dismissed certain claims without prejudice (Oklahoma, et al. v. Purdue Pharma L.P., et al., No. CJ-2017-816, Okla. Dist., Cleveland Co.)....