May I add that regardless of where and spin accidents occur the main reason for practice is to get an understanding and feeling of the flight conditions conducive to spin upsets... in my actual opinion spins (ditto for spirals) should be done visually AND (always with a CFI or another very experienced pilot) under the IFR hood both full and partial panel, and as long as all of the above mentioned precautions are observed ( aircraft limitations, performance, practice altitude, weather, personal limitations etc.) all part of proper ADM anyway.
rhov