That could be true...but it's likely to make the papers.In fact it already has at least a bit.What is seen cannot be "un-seen".And yes I'd know that if it's not allowed into evidence I can't tell anyone,including fellow jurors,that I'm voting not guilty partially because of his past.
Call it jury nullification if you wish but in the end *I* will determine what's pertinent and what's not...not some terrorist in a black robe.
You could hang the jury easily, but convincing it without revealing prejudice would be harder.