What is the test for peremptorily excusing a prospective juror?

In order to rebut the defendant's showing, the prosecutor need not show a reason rising to the level of cause. There are any number of bases on which a party may believe, not unreasonably, that a prospective juror may have some slight bias that would not support a challenge for cause but that would make excusing him or her desirable. Such reasons, if they appear to be genuine, should be accepted by the court, which will bear the responsibility of assessing the genuineness of the prosecutor's response and of being alert to reasons that are pretextual. See, e.g., People v. Hall, 35 Cal.3d 161, 197 Cal.Rptr. 71, 75, 672 P.2d 854, 858 (1983) (en banc) (reasons proffered by prosecutor for peremptorily excusing blacks were equally applicable to whites not excused; held, defendant's prima facie showing not rebutted). If the court determines that the prosecution's presentation is inadequate to rebut the defendant's proof, the court should declare a mistrial and a new jury should be selected from a new panel.