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Since there were four swabs in the box they got labeled a, b, c, d. swab "a" here was from the grip of the gun. and i did the chemical test for the possible presence of blood on the swab which gave me a positive result. so that's this column here. whether or not i did that chemical test. the next column is whether or not that sample gave me an indication of a mixture of multiple people or if it was a single source. so this one here, yes, meaning i got a mixture of dna from the testing of that sample. i was able to resolve this mixture out. i was able to pick out or determine the major dna prof...

Locations that i test, and it matches an individual, what is the relevance of that one location matching an individual? there could be, you know, maybe three other people, four other people in this room that match that location. so i need to put a statistical relevance to that match. so when i have 13 locations, i perform what's called a random match probability. when i have any amount of locations that i get, i perform a random match probability. and it's the possibility that you would pull a random person off the street and test their sample, and that they would match that unknown dna profil...

That all in? >> yes. >> tell us briefly about the product rule. >> the product rule, it's a simple statistical concept that says if you have a frequency for one event and a frequency for another independent event, and you want to see what's the frequency that both these events could occur at the same time, you can multiply the frequencies together. so, for example, if you have a coin and you flip that coin you have a 50% chance of heads, 50% chance of tails. well, if you want to see what's the probability that i'm going to have two coins and i'm going to flip both and they'll both land on head...

The relevance of that one location matching an individual. there could be maybe three other people, four other people in this room that match that location. i need to put a statistical relevance to that match. when i have 13 locations, i perform what's called a random match probability. when i have any amount of locations that i get, i perform a random match probability. if the possibility that you would pull a random person off the street and test their sample and that they would match that unknown dna profile that i got, whether it's at one location, two locations or all 13 or 15 locations. ...