That’s unconstitutional, says a Ninth Circuit panel in yesterday’s Williams v. Cavazos decision (which seems correct to me). An excerpt:
[...]As a general matter, the Sixth Amendment does not prohibit the mid-deliberation dismissal of jurors who are unable to serve or who engage in misconduct. In Miller, for example, we found no constitutional violation in the dismissal of two jurors after deliberations had begun: one of whom was sick with the flu, and another who had been intoxicated the previous morning and had fallen asleep during the rereading of testimony. To the contrary, we held that the “California substitution procedure followed by the trial court” — Penal Code section 1089 — was constitutional because it “preserved the ‘essential feature’ of the jury required by the Sixth and Fourteenth Amendments.” …
It is just as clear, however, that the Sixth Amendment does not allow a trial judge to discharge a juror on account of his views of the merits of the case…. The jury is the only actor permitted to determine guilt — not the judge. It is well-established, of course, that “a judge may not direct a verdict of guilty no matter how conclusive the evidence” in a criminal case. It would similarly vitiate the “essential” role of a jury to act as a “safeguard” against both the power of the state and the court for a judge to selectively dismiss jurors based on the views of the merits of the case they express during deliberations. Such dismissals are thus prohibited as well, because a court cannot “do indirectly that which it has no power to do directly.”
Indeed, no one, including the judge, is even supposed to be aware of the views of individual jurors during deliberations, because a jury’s independence is best guaranteed by secret deliberations, such that