U.S. District Judge Dan Aaron Polster will allow plaintiffs in the national multi-district opioid litigation to obtain and preserve former FDA chief David Kessler’s expert testimony so that it can be used at future trials if he is again named FDA commissioner or takes on another official role under the Biden administration that could prevent him from testifying as an expert witness in the case. Polster on Monday (Jan. 11) issued an order saying he would allow the preservation deposition...