"It didn't smell good," said Gorgone.
[Updated at 4:50 p.m. ET]
West had Gorgone point out to the jury what stains he tested from Martin's hooded sweatshirt.
[Updated at 4:48 p.m. ET]
Gorgone said he does not determine or predict how DNA gets onto a surface.
[Updated at 4:45 p.m. ET]
West is now going back over the DNA results from Martin's hooded sweatshirt.
[Updated at 4:43 p.m. ET]
Gorgone is explaining how he uses chemicals to isolate DNA evidence and tests it.
[Updated at 4:41 p.m. ET]
West is asking Gorgone about how he tests materials for the presence of blood.
[Updated at 4:39 p.m. ET]
Gorgone said the general practice is to let "wet" evidence air dry before it is placed in a plastic bag to avoid degradation of the DNA. The sweatshirts were still damp when he pulled them out of the plastic bag for testing.
[Updated at 4:35 p.m. ET]
Martin's sweatshirts were sealed in biohazard plastic bags when he received them for testing.
[Updated at 4:33 p.m. ET]
Gorgone is explaining how "wet" biological evidence should be dried to avoid the risk of environmental factors degrading the DNA evidence. West is now asking about how Martin's sweatshirts were handled by the evidence collectors.
[Updated at 4:29 p.m. ET]
West is asking Gorgone about how his lab is accredited and standardized.
[Updated at 4:26 p.m. ET]
Gorgone said one stick is used to scrap each finger on one hand, and another stick is used for the fingers on the other hand.
[Updated at 4:24 p.m. ET]
West keeps making the point that Gorgone was not involved in any DNA sample collection from evidence in the case or at the crime scene.
[Updated at 4:21 p.m. ET]
Gorgone said when he tests fingernail scrapings, he is really just looking for DNA that is foreign to person's whose fingernails are being tested.