(a) Application of part to law enforcement officers. Except only as provided in subsection (b) of this Code section, nothing in this part shall apply to a duly constituted law enforcement officer in the performance of his official duties in ferreting out offenders or suspected offenders of the law or in secretly watching a person suspected of violating the laws of the United States or of this state, or any subdivision thereof, for the purpose of apprehending such suspected violator.

(b) When in the course of his or her official duties, a law enforcement officer desiring to make use of any device, but only as such term is defined in Code Section 16-11-60, and such use would otherwise constitute a violation of Code Section 16-11-62, the law enforcement official shall act in compliance with the provisions provided for in this part.

(c) Upon written application, under oath, of the district attorney having jurisdiction over prosecution of the crime under investigation or the Attorney General made before a judge of superior court having jurisdiction over the crime under investigation, such court may issue an investigation warrant permitting the use of a device for the surveillance of a person or place to the extent the same is consistent with and subject to the terms, conditions, and procedures provided for by 18 U.S.C. Chapter 119. Such warrant shall have state-wide application and interception of communications shall be permitted in any location in this state.

(d) Evidence obtained in conformity with this part shall be admissible only in the courts of this state having felony and misdemeanor jurisdiction.

(e) Defenses. A good faith reliance on a court order or legislative authorization shall constitute a complete defense to any civil or criminal action brought under this part or under any other law.