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It's confusing. you'd think the guy, zwrus say ithat's where as a layperson, doesn't really add up. >> when you look at the dna information, there are a number of studies that say when you grip an item, you're more likely, the it's called touch dna. when you grip an ip shlg you're more likely to leave more dna. this particular weapon in order to unload the weapon because of the nature of the weapon, you had to grip it tightly. we have three different demonstrations in the courtroom where that worked and it showed that happened. each of the experts say yeah, you're more likely to leave more dna...

Attorneys pointed out in contrast, his partner never drew his weapon at any time. police say a gun was found in the car, but pross claimed he was planted. the only dna on the weapon, stockily's. dash cam video after the shooting show stockily rifling through bag in his squad car. prosecutors say what he was doing, the defense argued he was looking for medical supplies to save smith's life. it all began when stockily and his partner tried to corner smith in the parking lot of a fast food restaurant believing they caught him in a drug deal. stockily testified he thought he saw a gun as smith fle...

With this, it is rare and they used this word, it is extremely rare to find dna or fingerprint on a weapon even though they know the individual handled the weapon. so, the absence of dna means nothing. we don't leave -- >> but does the presence of it mean something? >> it proves what jason said he did. he unload ed the weapon. picked it up and unloaded it. he said he did that before any of this became an issue. but the absence of dna means nothing. three dna experts testified, erin, on behalf of the state. not the defense experts. these were the state's experts. that you can draw no conclusion...

Providing a more detailed description, they don't have a lot to go on. you know, now the case will focus on intelligence also, trying to found out is there a robbery crew they've been pursuing in the greater chicago metro area that consists of two white men and a black men. is there a known group of offenders that might meet the group description? beyond that, this is a difficult investigation. >> the officer was stripped of his gun and maybe his police radio. what does that tell you about the suspects? >> they have at least one firearm and now they have two. i think they took his taser too. m...

Who live here and if not for the connection of having a girlfriend here, it would be a very wide area for authorities to search. that is what led us here. again, a connection with a girlfriend. someone apparently who knows him and now police are questioning her. authorities say she is not under arrest but is just someone they hope to get information from that could lead them to the suspect. >> nbc's rahima ellis from brooklyn. thank you. let's turn to karen desoto, professor of political science at new jersey city university. dna, pizza crust. put it together. >> this is amazing. touch dna, a ...