Whether a trial court's refusal to remove a potential juror who admits she cannot be certain she can be fair violates the Sixth Amendment guarantee of an impartial jury?

QUESTIONS PRESENTED 1. Whether a trial court’s refusal to remove a potential juror who admits she cannot be certain she can be fair violates the Sixth Amendment guarantee of an impartial jury? 2. Whether a two-step interrogation technique used to undermine the Miranda warnings combined with a deliberate attempt to diminish the importance of the warnings renders the post-warning statements inadmissible? i