048-1 Wyo. Code R. § 1-5
(a) Any notice which the Division is required by these rules to provide, shall be provided in writing and delivered by hand or sent by certified mail, return receipt requested, to the latest known address of the concerned person or entity which appears in the records of the Division. It shall be the responsibility of each person and entity certified or licensed under these rules to keep the Division informed of its current mailing address.
(b) Any notice which a person or entity is required by these rules to provide to the Division shall be provided in writing and sent by certified mail, return receipt requested, or delivered by hand to the Division at the following address:
Wyoming Department of Health
Office of Emergency Medical Services
2300 Capitol Avenue
Hathaway Building, 4th Floor
Cheyenne, Wyoming 82002
Should the issue arise of whether such notice was received, the return receipt from the U.S. Post Office or a receipt signed and dated by an employee of the Wyoming Department of Health's Office of Emergency Medical Services shall be presumptive evidence that notice was provided.
048-1 Wyo. Code R. § 1-5