34 C.F.R. § 81.15

(a) The Federal Rules of Evidence do not apply to proceedings under this part. However, the ALJ accepts only evidence that is—

(1) Relevant;

(2) Material;

(3) Not unduly repetitious; and

(4) Not inadmissible under § 81.13 or § 81.14.

(b) The ALJ may take official notice of facts that are generally known or capable of accurate and ready determination by resort to sources whose accuracy cannot reasonably be questioned.