Well, there' s more than one plane on an arrow. In this case they mean a plane from the same distance from the point of the arrow on opposite positions on the arrow so you have at least 7/8 inch. A 3 blade head would have them on the same plane also. I think the law was intended to keep you from stacking 3 blades one behind the other down the arrow shaft.... HEY.... that' s a spear. You tellin' me I can' t go elk huntin' with my spear.[][] I really think the officer took a lot on himself. I see no way they' d be illegal. That doesn' t mean they' re not a piece of crap though.[:-]