Is there any hard evidence to back this up?
I hear this sort of claim made all the time on forums, don't do (or carry) X with your gun or you'll be seen as a cold-blooded killer and will never get a fair trial, where X can be any of the following:
- Trigger modification
- "Unusual" types of defense ammo
- Laser sights
- Red dot sights
- Extended magazines
- Spare magazines
I asked a lawyer -- granted, just one lawyer who specializes in 2A law -- and he said that's all internet myth and not substantiated by anything he's ever seen.
This specific Extreme Defender doesn't look all that extreme, apart from the name. Cheap ball ammo can achieve extreme penetration for $0.20 and destroy living things just as quick as any other load if it hits in the right spot.
On the other hand, there may be legal precedent for this or that type of 9mm ammunition being challenged. I'd just like to know what it is so I can review it for myself.