The Department of Social Services may furnish any person who is cared for at the expense of the state or any town with transportation to any other state or country if such person has in such other state or country legally responsible relatives who are able, or friends who are willing, to aid in his support, or if he has any other private means of support in such other state or country, provided the Commissioner of Social Services determines that the interest of the state and the welfare of such person will be promoted thereby.