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Starting right now. good morning, we want to welcome our viewers. i'm wolf blitzer in for carol costello. this is a special edition of "newsroom." lots of news happening right now. stakes huge. tempers are hot in the george zimmerman murder trial. attorneys argued until late last night over what could be key pieces of evidence. listen to this rather testy exchange between prosecutors and zimmerman's defense lawyers. >> it's simply unfair for mr. zimmerman not to put on his defense because of the state's tactics. it was a strategy, obviously, because they had it in january and kept it from us...

Their ck, somebody in a mount position striking, throwing, pushing, whatever the case may be, driving the person down, underneath, what would their perception be at that time? i have to look at it at that time and say my perception, what would the perception be given the dark environment, the continual attack. then i have to leave there and figure out what would be a response. >> so you've identified a couple of environmental -- >> all right. we're getting more background on why dennis root, this private investigator, has been called by the defense. you see mark o'mara questioning him, potenti...

I'm not clear on that because i couldn't hear everything the judge was saying. >> what is the difference between demonstrative and substantive? >> demonstrative means you get to use it in closing arguments and it helps you explain the evidence. substantive evidence means you get to consider it as true, substance, as evidence of what happened that evening. there's a very big distinction in the law and so even if the defense can use it as demonstrative evidence. it's just an a aid. an aid to help the jury where substantive evidence means they can consider it as evidence of innocence or guilt. so...

Their weapon or any other person. >> your objection is? >> relevance. >> i have to sustain on that one. >> okay. >> anything in the discharge of his firearm, from your view, evidence to you that mr. zimmerman acted in some additional form or fashion of ill will, spite or hatred realizing that of course the discharge of a firearm at somebody is an event that can cause death. >> i'm going to object based on improper based on our limited motion. >> please approach. >> all right. let's take another quick break as they approach the judge. the defense and the prosecution. they've got another issue. ...

Or text messages from trayvon martin's cell phone were available. >> well, you know, early on, wolf, in this case, you heard the defense team raise this issue about discovery violations. there were several other issues that they had with the prosecution and this is one of them. to my understanding, the judge will rule on this and others later, but they've been raising this issue all along and this particular situation with the information on trayvon martin's phone, not really new when it comes to what they've been talking about regarding how the prosecution has passed evidence to them. >> pros...