(January 20, 2016, 1:02 PM EST) -- ST. LOUIS — There was no error in permitting an expert to testify about the substantial similarity in chemical structure between scheduled controlled substances and products sold at a store owned and run by defendants, the Eighth Circuit U.S. Court of Appeals held Jan. 14, affirming convictions against them (United States of America v. James Robert Carlson, No. 14-2986, United States of America v. Lava Marie Haugen, No. 14-2987, United States of America v. Joseph James Gellerman, No. 14-3242, 8th Cir.; 2016 U.S. App. LEXIS 569)....