SAN DIEGO -- Police investigators and U.S. Marines continued to search Friday through tons of debris at a local landfill for any clue that might help them find little Jahi Turner.

The search at the Miramar landfill continued non-stop overnight and is now in its fourth day, San Diego police Lt. Dave Elliott said.

MISSING JAHI TURNER Light-skinned African-American 30 pounds, 30 inches tall Black hair Wearing blue "Winnie the Pooh" T-shirt, blue pants, and gray tennis shoes INFORMATION Citizen Access Phone System: (619) 570-1070 Tip Hot line: (619) 235-8477 Download A Missing Flyer SOUND OFF Share Your Thoughts

Thursday, 80 local Marines joined in the effort at the landfill, where tons of garbage picked up from the area near where the 2-year-old boy allegedly vanished are being raked for clues.

"We will continue to be here for 24 hours a day, as long as it takes to get through the area that we want to have a chance to look at," San Diego police information officer Dave Cohen said earlier this week.

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Police have refused to verify media reports that Jahi, who has been missing since May 2, may have never been at a playground when he disappeared, as reported by his stepfather, Tieray Jones.

Authorities also would not confirm or deny news reports, including in the San Diego Union-Tribune, that Jones, 23, failed a lie detector exam.

"I am not going to get into any specifics ... but I will tell you there were inaccuracies in that (newspaper) article," Cohen told reporters at an afternoon briefing Thursday.

He said he was advising reporters to "accept the veracity of the article's statements at your own risk."

"We have not commented on details of the investigation in the past, and we're not going to start today," Cohen said.

Both the Union-Tribune and KOGO Radio cited unnamed law enforcement sources in describing Jones' supposed polygraph results.

Detectives also could not find Jahi's fingerprints on playground equipment in the Balboa Park tot lot where Jones said the boy vanished, indicating the boy had not been there lately, according to the newspaper.

Police have said Jones is not a suspect in the child's disappearance, and Cohen said the department is still operating under the presumption that the child was abducted.

Jones told authorities he left Jahi with an unknown woman and two other young children, then walked a few hundred yards to a soda machine about 2:15 p.m. last Thursday.

He said that when he returned to the playground off 28th and Beech streets some 15 minutes later, his stepson was gone, along with the others.

Police still are calling for a woman who Jones says he saw at the park that day to come forward and reveal whatever relevant facts she may know.

Jahi is a light-skinned African-American, about 30 inches tall and weighing 30 pounds. At the time of his disappearance, the boy was wearing a blue, long-sleeve T-shirt with a rendering of the "Winnie the Pooh" cartoon character on it, blue nylon pants with an orange drawstring and gray Michael Jordan tennis shoes.

Officials urged anyone with information in the case to call the SDPD's Central Division "juvenile hotline" at (619) 744-9521, or San Diego County Crime Stoppers' anonymous tip service at (619) 235-8477.