What happens at the end of a jury case would not matter so much if we ensured that jurors were screened for bias at the beginning. Unfortunately in Ontario and other Canadian jurisdictions we have no real mechanism to do that. In Ontario, the Juries Act allows challenges based on eligibility (citizenship, criminal record, age) or a personal interest in the action. But as to whether a juror is “impartial or biased” there is no mechanism to weed them out. Under s. 108 of the Courts of Justice Act, the judge may discharge a juror on grounds of “illness, hardship, partiality” but partiality is not defined nor is a process in place to determine such.
https://www.thelawyersdaily.ca/articles/5718/civil-juries-gambling-in-a-new-age-patrick-brown?category=columnists