641—43.8 (136B) Exemptions. Certification requirements shall not apply to:
	  1. 	 Those persons who test for radon/radon decay products in buildings that they own.
	  2. 	 Those persons testing for radon/radon decay products as part of scientific research approved by the department.
	  3. 	 State officials conducting radon testing as part of the state’s radon testing program or local officials acting on behalf of the state, and approved by the department.
	  4. 	 Officials conducting radon testing as part of government programs in the United States or contractors working for the United States government.