Dana v. Roberts

Tlie principal guard upon jurors in tiiis state, is, tlieir oath and tlieir virtue — if they are suffered to enter into conversation with people respecting the causes they have under consideration, the purity of trials hy jury, the great harrier of liberty and justice will be corrupted; it ought therefore to be guarded with the most vigilant attention. The juror, ivas not admitted to testify upon tlie motion, either to criminate or exculpate himself. 1 Durn. 11; 1 Str. 642.