ANTIOCH, Calif. – This unincorporated corner of Antioch, California, zip code 94509, has 101 registered sex offenders, if you check California's "Megan's Law" database. 

Phillip Garrido, suspected of kidnapping, raping and imprisoning Jaycee Lee Dugard, is one of them. Kids in the neighborhood nicknamed him "Creepy Phil" because of his strange behavior.

Garrido and his wife Nancy have pleaded not guilty to 29 criminal charges, including forcible abduction, rape and unlawful imprisonment. They are being held without bail at the El Dorado County Jail in Placerville, Calif., in the county where Dugard was abducted in 1991.

VIDEO: Bone fragment found near suspect's house

In 1977, Garrido was convicted of kidnapping and raping a woman in Reno, Nevada.  He got out on parole eleven years later. In court documents from his trial, Garrido is quoted at length about his sexual attraction to children, something he blamed on heavy drug use when he was a young man.

A neighbor, Betty Unpingco, remembers a few years ago when Garrido helped set up stereo speakers for her son's high school graduation party. He kept lingering around the party, looking at the teenagers in a strange way, Unpingco recalled.

"Somebody informed us that he was down the street," Unpingco said, "and he was motioning for young girls to come over and talk to him."

That's when Unpingco told her children to be careful about "Creepy Phil."

And then, she discovered his name on the database of sex offenders.

"We instituted the buddy system after that," Unpingco said, meaning that her children were told not to go outside the house alone, always with at least one sibling.

Her house, just a few doors down the street from where Garrido and his wife lived with Dugard and her two daughters allegedly fathered by Garrido, has a surveillance camera pointed outward now. 

Unpingco believes that her neighborhood, a rural area on the outskirts of Antioch, has a disproportionate number of sex offenders. "We found they just dump them in this area," Unpingco said. "That's just not right."

One reason is that this neighborhood is not near any public schools or city parks, places where children are expected to congregate, so it's legal for registered sex offenders to live here. But because it's an unincorporated area with no local police department, law enforcement is spread pretty thin.

The local sheriff has admitted that his department dropped the ball three years ago when a neighbor called to complain that there was something strange going on with children in the back yard at the Garrido home. 

A deputy stopped by, but only spent a few minutes at the front of the Garrido house – not noticing the strange warren of sheds and tents out back where Dugard spent the last 18 years of her life.