developed under subsection (a). (e) Regulations The Secretary may prescribe such regulations as may be necessary to carry out the provisions of this section. (f) Rule of construction This section may not be construed to inhibit the authority of an Indian tribe to enter into or maintain a compact or contract under the Indian Self-Determination and Education Assistance Act ( 25 U.S.C. 5304 et seq.). . 103. Liability protections for health professional volunteers at Indian Health Service Section 224 of the Public Health Service Act ( 42 U.S.C. 233 ) is amended by adding at the end the following: (r) Certain Indian Health Service volunteers deemed Public Health Service employees (1) In general For purposes of this section, a health professional volunteer at a Service unit shall, in providing a health service to an individual, be deemed to be an employee of the Public Health Service for a calendar year that begins during a fiscal year for which a transfer was made under paragraph (4)(C). The preceding sentence is subject to the provisions of this subsection. (2) Conditions In providing a health service to an individual, a health care practitioner shall, for purposes of this subsection, be considered to be a health professional volunteer at a Service unit if all of the following conditions are met: (A) The service is provided to the individual at the facilities of a Service unit, or through offsite programs or events carried out by the Service unit. (B) The Service unit is sponsoring the health care practitioner pursuant to paragraph (3)(C). (C) The health care practitioner does not receive any compensation for the service from the individual, the Service unit, or any third-party payer (including reimbursement under any insurance policy or health plan, or under any Federal or State health benefits program), except that the health care practitioner may receive repayment from the Service unit for reasonable expenses incurred by the health care practitioner in the provision of the service to the individual. (D) Before