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Section 701 Of Chapter 1. Competency From California Evidence Code >> Division 6. >> Chapter 1.

701
. (a) A person is disqualified to be a witness if he or she is:
  (1) Incapable of expressing himself or herself concerning the matter so as to be understood, either directly or through interpretation by one who can understand him; or
  (2) Incapable of understanding the duty of a witness to tell the truth.
  (b) In any proceeding held outside the presence of a jury, the court may reserve challenges to the competency of a witness until the conclusion of the direct examination of that witness.