SAN DIEGO -- Blood found on David Westerfield's jacket and on the carpet in his motor home belonged to Danielle van Dam, a DNA expert testified Thursday.

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Annette Lynn Peer testified that she was able to obtain the 7-year-old's DNA from a pair of underwear and later from a rib bone after the child's body was recovered.

The forensic biologist testified that DNA taken from a blood stain on the floor of Westerfield's motor home matched DNA taken from a blood stain on a green jacket belonging to the 50-year-old man.

"They were the same," Peer testified.

"Were you able to calculate an estimate of how rare those matching profiles were between Danielle van Dam and the carpet stain?" prosecutor George Clarke asked the DNA analyst.

"Yes, I was," Peer answered.

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Analysis From Attorney Milt Silverman

"With regard to the Caucasian population, what is the approximate likelihood of someone chosen at random from that population, having a set DNA genetic type that was found in both the carpet stain and Danielle van Dam?" Clarke asked Peer.

"That frequency would be -- in the Caucasian population -- approximately one in 130 quadrillion," she said.

"Quadrillion means what?" the prosecutor asked.

"Fifteen zeroes are in quadrillion," Peer answered.

The frequency for a random person from the Caucasian population having the same DNA as was found on the blood stain taken from Westerfield's jacket is one in 670 quadrillion, Peer testified.

"The numbers indicate that this profile is extremely rare in the Caucasian population, but with the African-American and Hispanic populations it's ever rarer," the DNA analyst testified.

Peer said that during her initial search of the defendant motor home's on Feb. 6 she lifted a blood stain from some curtains near the driver's seat.

She said a blood stain found on Westerfield's jacket was consistent with his DNA.

Earlier, police criminalist Sean Soriano (pictured, left) testified that he found four stains on the green and blue jacket, which Westerfield took to the dry cleaners Feb. 4.

Three stains tested positive for the presumptive presence of blood, the criminalist testified. They were on the front right middle, the front right shoulder and the neck portion of the jacket, he said.

The portions of the jacket where the stains were found were then cut out, packaged and sent to a lab for further DNA testing, Soriano said.

He testified that he also found blood stains on a blanket and a bean-bag chair from the victim's room.

The criminalist said he also removed two long, blond hairs from inside boxer shorts seized from the laundry room of Westerfield.

Under cross-examination by defense attorney Steven Feldman, Soriano said he didn't find any semen on bedding seized from Westerfield's residence or motor home.