For most people they aren't. You would have to check with your local animal control, fish and game and USDA for license and requirements as you are not only under local jurisdiction with a primate or most exotics.
www.junglefriends.org www.simiansociety.org www.petmonkeyinfo.org www.monkeyzone.com
www.junglefriends.org www.simiansociety.org www.petmonkeyinfo.org www.monkeyzone.com