Okla. Admin. Code § 340:2-5-68
Following a hearing request, there is no direct or indirect contact regarding the merits of the case between the AHO and a person with a direct or indirect interest in the case unless there is notice to all parties and an opportunity to participate in the communication, except the AHO may:
(2) contact the local office in order to obtain information regarding:
Added at 19 Ok Reg 2199, eff 6-27-02