(a) The coroner shall issue subpoenas to or otherwise compel the attendance of witnesses; and he shall administer to such witnesses the following oath:

"The evidence that you shall give this inquest on behalf of the state concerning the death of ______________ (or a person unknown, as the case may be) shall be the truth, the whole truth, and nothing but the truth, so help you God."

(b) When a coroner conducts an inquest into the death of an individual, he shall be authorized to issue subpoenas to compel production of any books, records, or papers relevant to the cause of death. Any books, records, or papers received by the coroner pursuant to the subpoena must be regarded as confidential information and privileged and not subject to disclosure under Article 4 of Chapter 18 of Title 50. The actual costs of copying any books, records, or papers for the purpose of responding to a coroner's subpoena under this subsection shall be paid out of county funds to the person or entity required to respond to that subpoena, and the governing authority of the county of which that coroner is a public officer shall pay those costs within 30 days after a bill therefor is submitted to the county; provided, however, that the county shall not be responsible for duplication costs under $25.00.