This is interesting and the case name (wait for it) sort of ironic. The district judge ordered the parties to disclose to each other whether they had done a mock trial, to keep a list of participants, and to cross-check participants against potential jurors and notify the other side if there was a match. In addition, the judge ordered the parties to disclose in camera a list of participants.
Obviously, I think, a lawyer who knows that a potential juror participated in a mock trial has to disclose that fact, but this goes beyond that and is not something I’d seen before.
The case is 3rd Eye Surveillance, LLC v. City of Ft. Worth (E.D. Tex. Jan. 12, 2017), here.