I had heard on another site that they are not legal in some states because of the open back that is defined as " barbed".

I suppose because the back edge of the blade is not tight or flush with the shaft they consider this " open" at the back and therefore not legal.

Some F&W agencies in states require the arrow can be pulled out or slide back out of a poor hit. hence the reason that they don't want anything that can catch and hangup on the hide?

Never used them myself so no first hand experience. Just thought I would pass on the observation by others, that they are not closed at the back edge and may pose a legal problem with this design in some states.

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