The rules of evidence as applied in a nonjury civil case in a district court of this state shall apply to a contested case except that evidence inadmissible under those rules may be admitted if the evidence is:

1. (1) necessary to ascertain facts not reasonably susceptible of proof under those rules;
2. (2) not precluded by statute; and
3. (3) of a type on which a reasonably prudent person commonly relies in the conduct of the person's affairs.

Added by Acts 1993, 73rd Leg., ch. 268, Sec. 1, eff. Sept. 1, 1993.