SAN DIEGO -- Computer pornography was found on a computer in David Westerfield's son's bedroom and associated with the son's e-mail accounts, a computer expert called by the defense testified today.

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Marcus Lawson, president of Global CompuSearch of Spokane, testified that he found two photographs of naked women and anime computer animations on the hard drive of a Gateway computer in an upstairs bedroom used by the son, David Neal Westerfield.

The defendant's middle initial is "A."

Defense attorneys are trying to show that the defendant is not responsible for the pornographic images -- including those of young children -- found on his computer equipment.

David A. Westerfield, a 50-year-old self-employed design engineer, is on trial for the kidnapping and murder of 7-year-old Danielle van Dam. He also faces a misdemeanor charge of possession of child pornography. Investigators believe pornography is a motive for the crime.

Lawson told jurors that he examined copies of hard drives, zip disks and compact disks made by police and took numerous screen captures -- essentially photographs of what came up on the computer monitor at a given time.

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Defense attorney Steven Feldman asked Lawson if there was a theme to the animations.

"A considerable number of the screen prints showed bondage -- where women were tied in ropes," Lawson said.

A screen print of an e-mail to a DNWest@hotmail.com, as quoted by Lawson, said: "Thanks for joining anime.com."

Lawson also confirmed screen prints the defense entered into evidence last week, that a computer in the office of Westerfield's house was used to access pornography on Feb. 4 at 4:47 p.m., when the defendant was busy with detectives.

Feldman mentioned last week's suggestion that the clock on the computer may have been doctored.

"Did you see any evidence that that happened on any of the computers you examined?" Feldman asked.

"No, I did not," Lawson answered. He said there's usually signs when a clock has been tampered with, such as files being accessed before they were created. Nothing like that was apparent on Westerfield's computers, he said.

On Tuesday, San Diego police detective Johnny Keene testified that he collected Westerfield from his Sabre Springs home that Monday around 3:40 p.m. and took him to the Northeastern sub-station in Rancho Penasquitos. The defendant remained there until approximately 11:30 p.m.

Defense attorneys have alleged that Westerfield -- even though he wasn't under arrest -- couldn't leave and hadn't eaten when he spoke to authorities.

A neighbor testified that Westerfield did not follow his typical routine with his motor home the weekend the second-grader disappeared.

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Janet Roehr (pictured right), who lives across the street from Westerfield in Sabre Springs, said that the defendant typically left the 35-foot motor home at his house overnight before leaving for a trip.

He usually unloaded and cleaned it at home following a trip, she said, and normally had someone help him.

Roehr said that she only saw the 1997 Southwind for a few minutes the afternoon after the girl was discovered missing. She didn't see it again.

Her husband, Mark, testified he did not see the motor home the day before.

Westerfield's next-door neighbor, Paul Hung, testified that he saw the defendant's motor home parked near Westerfield's home about 8:30 a.m. on Feb. 2.

"I saw the motor home parked on the side (of the house)," Hung said. "No, I didn't see David that morning."

Hung testified that a half-hour later, the motor home was gone.

That night, Westerfield was not around as searchers combed the area around the van Dam home, Hung testified.