By Michael Eisenkraft, Cohen Milstein Sellers & Toll PLLC (January 23, 2017, 12:33 PM EST) -- Grappling with the credibility of witnesses has been a focal point of legal systems for thousands of years.[1] Despite all this practice, however, our legal system has not yet established a uniform approach to dealing with a witness credibility issue in a somewhat new context — a securities class action complaint governed by the Private Securities Litigation Reform Act, Pub. L. No. 104-67, 109 Stat. 737, codified at 15 U.S.C. § 78u-4. This article explores why this issue has arisen since the passage of the PSLRA, enumerates the different approaches taken by a number of courts and defense counsel grappling with this issue, and explains why the approach taken recently in Union Asset Management Holding AG v. SanDisk LLC, Civ. No. 15-01455, 2017 U.S. Dist. LEXIS 977 (N.D. Cal. Jan. 4, 2017) makes sense....