Whenever written notice is required or authorized under this Part, such notice may be given by the Director, his authorized representative or any other person who may be authorized by law by serving a copy of such notice personally upon the person to be served or by leaving a copy at his place of residence or place of business or by mailing a copy by certified mail, return receipt requested, to his last known address. If such person is not in Guam or cannot be found in Guam after reasonable search, the notice shall be conspicuously posted on the premises concerning which notice is being given. Where notice is given by mail, such notice shall be complete upon deposit in the United States Post Office in an envelope addressed to the last known address of the person to whom notice is being given and bearing sufficient postage.

SOURCE: GC § 9500.16.