In the United States you must have a falconry license to own a bird of prey. This means taking a test, finding a sponsor, getting proper housing and equipment before you can get your permit. You then serve a two year apprenticeship during which you may only have ONE bird, either a wild Redtail or a wild Kestrel. These birds Have to be taken  from the wild. After your two years you become a general falconer and may possess two birds of varying species. Birds may be purchased from breeders but I know of none in the U.S. who will sell you a bird with out the proper documentation. Birds of prey make terrible 'pets'. They need to flown and hunted. They HATE to be petted and don't respond to affection.