For the purpose of conducting an investigation described under section 6(3) or 6(6) of this chapter, the department of state revenue may:
Each witness examined by the department is entitled to receive a fee equal to the same fee paid witnesses subpoenaed to appear before a court of record. The witness fee shall be paid in the same manner that erroneous tax payments are refunded under IC 6-4.1-10.
IC 6-4.1-12-7