Comment Re:this is completely normal (Score 1) 64
I admit I was relieved to hear you acquitted the guy -- so it's moot whether you were prejudiced. But otherwise your independent research squarely violated the rules. It could have cut the other way, too: If you'd convicted the guy on the merits and your independent research come to light, it could have caused a mistrial.
Generally "bad acts," including prior convictions, are not admissible because they are so deeply prejudicial; so the prosecutor couldn't have brought them in, either. The ideal is that trial be about the present issue, not a probability calculation based on the defendant's "badness" -- although in some cases like yours it may seem pretty ridiculous. On the other hand, in some places getting arrested for no reason is pretty common.
I think you implicitly respect the rule because you say "of course [you] never told any of the other jurors." So you trusted yourelf but not them. No harm, no foul here, but not a good thing to be doing. (Concession: I'm an attorney who has *almost* served on several juries, so I don't quite know what it's like; but I think I would find the temptation to poke around very strong, especially if I thought counsel was doing a crappy job.)