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Zimmerman knew all about this law. instead, they got this instructor to teach the jury what might have been going through george zimmerman's head at the moment he fired the shot. have a look. >> we also talked about imperfect self-defense where you may have started out being the person that was attacked but for whatever reason, you took it a step forward, now you are their aggressor. so that dynamic between, you know, two people involved in a fire or a scuff him, that could change. >> you used the term imperfect self-defense. >> right. >> is that the notion that sometimes the tables can turn? ...

Burned or unburned gun powder particles. i was looking for any kind of sooting present around the hole as well as looking at the ends of the fibers to whether they were blackened, singed or melting. >> if you would just stand back so the court reporter has a visual of you, that would help. what did you do to test-fire with this particular -- you took a cutting or what did you to? >> i did. i removed a portion of the back of the sweatshirt for testing purposes. >> all right. mr. de la ronal arondald it -- more forensic in nature or psychological?

Still on trial. rezza, keep an eye on things if you would, please, for us, live in cairo. i want to get us back live into the testimony in sanford, nevada. on the stand is a florida department of law enforcement crime lab analyst. the reason you are seeing a box on the stand, inside na box is a gun. it is the gun in question and she is a firearms analyst. >> and what type of fire. a is it -- firearm is it? >> it is a .9 mill mit ter cal tech semi automatic pistol. >> what do you mean by sigh automatic? >> in very basic terms, semi automatic means a pull of the trigger is required for each shot...

You if you recognize that? >> i do. >> how do you recognize that? >> the daily case number, the exhibit number and my initials. >> and what what do you recognize it to be? >> it is one fired 9 millimetre lugger cartridge case. >> when you receive a firearm in a fire casing, are you able to determine whether or not that particular casing came from that particular firearm? >> yes. >> how can you do that? >> with a submitted firearm and magazine that i will use laboratory and/or evidence ammunition to test fire that pistol. i will then collect the fired cartridge cases and compare those microscop...

Number and my initials. >> and this is, obviously, a sweatshirt that you examined in the case? >> yes. >> if you can show the members of the jury the area that you focused on as having a bullet that passed through it? >> this area right here was where i was looking right underneath the exhibit. >> as the previous exhibit, did you make a cutting from the exhibit? >> i did. >> is that depicted on the back of the exhibit, if you would come around and look. >> yes. >> both the cutting and then the area on the sweatshirt where it was cut out? >> yes. >> show that to the jury if you could. >> i ask ...