(September 26, 2017, 9:18 AM EDT) -- SAN FRANCISCO — Parties to a suit involving whether a health insurer violated the Employee Retirement Income Security Act by imposing overly restrictive standards filed trial briefs with a federal judge in California on Sept. 6 exploring the appropriate evidence needed at trial and how important expert testimony will be (David and Natasha Wit, et al. v. United Behavioral Health, No. 14-02346, Gary Alexander, et al. v. United Behavioral Health, No. 14-5337, N.D. Calif.)....