Witnesses disqualified by reason of mental incapacity, immaturity

Section 21. — The following persons CANNOT be witnesses:

[a] Those whose mental condition, at the time of their production for examination, is such that they are incapable of intelligently making known their perception to others;

[b] Children whose mental maturity is such as to render them incapable of perceiving the facts respecting which they are examined and of relating them truthfully. (19a)