(a) Potential Bias. When appropriate, the Assignment Judge shall inquire of potential grand jurors about such aspects of their background as may reveal possible bias or interest in a matter to come before the grand jury. The Assignment Judge shall instruct the grand jury that without the Assignment Judge's approval no grand juror shall participate in any matter in which that juror has a bias or a financial, proprietary, or personal interest; and if that juror wishes to participate, the juror shall forthwith so inform the prosecutor. The prosecutor shall forthwith inform the Assignment Judge, who shall determine, in camera, whether such bias or interest exists and whether it justifies excusal.
(b) Copy of Charge. When the judge designated by the Assignment Judge charges the grand jury, that judge shall cause a copy of the charge to be promptly furnished to each juror.