Rule 2:601 - General Rule of Competency(a) Generally. Every person is competent to be a witness except as otherwise provided in other evidentiary principles, Rules of Court, Virginia statutes, or common law. (b)Rulings. A court may declare a person incompetent to testify if the court finds that the person does not have sufficient physical or mental capacity to testify truthfully, accurately, or understandably.Adopted and promulgated by Order dated June 1, 2012; effective 7/1/2012; adopted and promulgated by order dated June 1, 2012; effective 7/1/2012.