What must an attorney do under a 'for cause' challenge?

In a 'for cause' challenge, an attorney must provide a specific reason or explanation for why a particular juror should be dismissed from the jury pool. This type of challenge is based on the belief that the juror is unable to be impartial due to biases, preconceived notions, or other factors that may affect their judgment.

The necessity to provide a rationale is crucial because the judge will consider the attorney's reasoning before deciding whether to grant the challenge. This process ensures that jurors who have the potential for bias or conflict of interest are identified and removed from the selection process, thus upholding the integrity of the trial.

In contrast, the other options do not align with the requirements of a 'for cause' challenge. An attorney cannot simply dismiss a juror without stating a reason, nor can they request a mistrial as a substitute for justifying their challenge. Citing case law, while potentially useful in some contexts, is not a necessary step in presenting a 'for cause' challenge to the court.