Bobert, you've got me all confused, now!

I thought it was the prosecution withholding this evidence 'cos they didn't want the defense to even know about it. Am I wrong on this?

Thing is, if it's not right to withhold evidence, it's not right to withhold evidence - regardless of whether you think it will help a scumbag/hurt a victim (or vice versa).

Whether that evidence is allowed in to be heard during the trial is a separate issue entirely and - as has been pointed out - up to the judge.

Similarly, Nazis (in the US) have the right to freedom of speech, however distasteful I consider what they say (my background is Jewish).

I'm a liberal leftie, but we can't have one set of rules for those we like/approve of and another for those we don't. I'm also one of those who think that Zimmerman sounds like a sleazebag and was clearly not justified in what he did - but that still does not justify the prosecution withholding evidence that they're afraid might help his defense.

Just sayin'... :7)