[Updated at 2:17 p.m. ET]
Di Maio says he believes Zimmerman's nose was broken and that either Zimmerman or someone on scene could have popped it back into place. Di Maio says that if it was just swelling on Zimmerman's, it shouldn't have gone down in only four hours.
[Updated at 2:16 p.m. ET]
Di Maio says if the evidence isn't dried first, you'll get mold and bacteria, which could damage the DNA. He's not surprised that the mishandled clothing had DNA on it.
[Updated at 2:14 p.m. ET]
Prosecutor de la Rionda asks Di Maio about Martin's hoodie. Di Maio agrees that people normally wear them large and that if something was in the front pocket, then the hoodie might be pulled down.
[Updated at 2:12 p.m. ET]
Di Maio agrees that the only two witnesses of the shooting are Zimmerman and Martin.
[Updated at 2:11 p.m. ET]
Di Maio says it could be difficult for you to breathe or swallow if you're on your back with a bloody nose and the blood is going back into your throat.
[Updated at 2:10 p.m. ET]
Prosecutor de la Rionda shows Di Maio a picture of Zimmerman's bloody nose. Di Maio says you would expect blood on the hand if you put it over that nose.
[Updated at 2:08 p.m. ET]
Zimmerman wouldn't have died from the lacerations to the back of his head, they're just "indicative of a hard impact," says Di Maio. One laceration was less than an inch, while the other was less than a 1/5 of an inch, according to Di Maio. Prosecutor de la Rionda demonstrates the sizes using his thumb and forefinger.
[Updated at 2:03 p.m. ET]
Di Maio agrees that the best person to document a person's injuries can be the medical professional who sees them in the flesh the next day. But he says their observations may not be accurate.
"Doctors aren't interested in the injuries, they're interested in treating the patient," said Di Maio.
[Updated at 2:00 p.m. ET]
Di Maio says you may or may not get bruises on your knuckles from punching someone.
"In other words, George Zimmerman could have hit Trayvon Martin and not left any bruising on his knuckles?" asked de la Rionda.
"That's correct, sir," Di Maio said.
[Updated at 1:57 p.m. ET]
Prosecutor de la Rionda is asking if a tree branch could have caused the injuries to the back of Zimmerman's head. Di Maio says "wood gives." De la Rionda is showing Di Maio a photo of the trees at the scene.
"You could have one of the injuries due to bumping against the tree, that's correct," said Di Maio. He also agrees that the injuries could have occurred as the two were rolling around on the grass and concrete.
[Updated at 1:54 p.m. ET]