DETROIT -

9:49 A.M.
Officer Joseph Weekley is in court in a light gray suit.

The Prosecution is expected to call two witnesses before adjourning to an undisclosed location for a demonstration of the flash-bang grenade used in the March 2010 raid.

Blood spatter testimony will be particularly gruesome, especially when you consider the victim was a 7 year old girl.

Witness: Cheryl Lozen of the Michigan State Police Forensic Science Division, Trace Evidence Examiner

Cheryl Lozen
She is an expert in blood spatter, blood stain analysis. Also an expert in fibers, microscopic evidence etc.
Blood stain patterned analysis is used to determine how blood stains occurred. They can corroborate or dispute verbal testimony by other witnesses.

They can range from stains barely visible to the eye to large pools of blood.

We use bright lights to see any stain that might be there.

There were stains on several surfaces, but the couch on west wall of living room had an accumulation of blood stains there.

She uses a laser pointer to identify the couch in a photo exhibit.

Prosecution: Is there a certain type of stain that's called?

Lozen: Yes, there was pooled blood, and some swipes of blood where the stain was moved. There were very stains on the south end of that couch.

She testifies she wasn't on scene at time of the incident.

The stains may have been impacted by other forces in the interim between the incident and examination.

There was some saturated blood on the cushions, and underneath cushion as well.
There were also some small splatter stains on exterior of a nearby door.

Stains on door appeared to be spray or spatter stains indicative of blood dispersed through the air.

Prosecution: Do gunshots cause spatter?

Lozen: Yes, they can.

Prosecution: Do they move backwards or in direction of the fire?

Lozen: There can be back-spatter where the blood comes back toward the gun, or forward spatter where the blood travels through exit wound with the bullet and is deposited on surfaces in direction of the bullet.

Blood spatters usually go in straight line. It can tell you what direction it came from. In this area, there were elongated splatters meaning they were coming from higher direction and hit on their way down.

Stains like that could be made from other forces, like expiration of blood from the lungs, also from cast-off--blood on fingers thrown off to make the stains.

We found blood or tissue on south wall. Those had appearance of possible blood or body tissue and were not appearing like liquid blood. Irregular shape. It was located just above the couch---a foot above the back of the couch.

Prosecution: Would it be out of the realm of possibility for the tissue to be back-spatter?

Lozen: Yes, it could. That's one possibility. Testing found they matched the victim. (2 samples)

This is photo of shield I took in the laboratory. (Speaking of ballistics shield carried by Weekly)