Whether Due Process is violated when a prosecutor relies on false testimony to secure a conviction but did not know that the testimony was false until after trial

QUESTION PRESENTED The question presented, which has divided federal courts of appeals and state high courts, and on which petition for certiorari is pending before this Court in Farrar v. Williams, No. 19-953 is: Whether Due Process is violated when a prosecutor relies on false testimony to secure a conviction but did not know that the testimony was false until after trial, as six courts have held, or whether Due Process is violated only where the prosecutor knows the testimony is false at the time of trial, as eight courts have held.