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Concerning the decision regarding the cal tek. can you explain to the jury your understanding of double action vs. single action guns? >> of course. a firearm that has double action requires the trigger in the hammer to do two separate things, two separate motions. one is as you are squeezing the trigger, the hammer was in front. was forward it has to come back. that's the one action. then it comes forward and it fires the firing pin, which sets off the firearm. single action would mean the firearm, the hammer mechanism is back and one, as you squeeze the trigger, it does one action, which is ...

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...

Approach? >> yes, you may. >> let me show you state's 165, ask you request you recognize that? >> yes. >> how do you recognize 165? >> again by the case number, the exhibit number and my initials. >> what is is that? what is contained in that exhibit? >> there is one fired jacket portion, two fired bullet jackets, fragments and one led core. >> and when you received parts of a bullet or fragments of a bullet and a firearm, are you able to compare those to determine whether or not those fragments were fired from a particular firearm? >> yes. >> expla into the jury how you do that. >> similar to...