An FBI cadaver dog searching the home of a missing Missouri baby has detected the scent of a human body, according to a police affidavit, which noted that investigators discovered soil in the backyard that had been "recently disturbed or overturned."

The document, obtained by Fox News' "Justice with Judge Jeanine," says the cadaver dog indicated a reaction to the scent of a dead person inside the parents' bedroom.

Police filed the affidavit to support a search warrant request for the home of Deborah Bradley and Jeremy Irwin, who reported 10-month-old Lisa missing on Oct. 4.

The affidavit says the dog was taken into the house Monday and indicated a "hit" on the floor of Bradley's bedroom. A judge approved the search warrant Tuesday, and police and the FBI conducted a daylong search Wednesday.

Court documents filed Friday said police took blankets, toys and clothing from the house, as well as rolls of tape and a tape dispenser.

Earlier on Friday, three Kansas City residents said they saw a suspicious man walking the streets with an infant on the night the child disappeared.

Mike Thompson told ABC's "Good Morning America" that he was heading home on his motorcycle around 4 a.m. local time when he noticed the man, who was dressed in a T-shirt, on a street near the baby's home.

"[It was] 4 o'clock in the morning, 45 degrees, the baby don't have a blanket or coat or nothing, and this guy's walking down the street," Thompson said. "I thought it was kind of weird."

Thompson claimed the infant -- who was only wearing a diaper -- resembled Lisa and said that he would recognize the man if he saw him again.

He said he waited about a week to report the sighting to police because he did not immediately make the connection to the girl's disappearance.

Two other witnesses, who were not named, said they encountered a similar scene a few hours earlier.

"It was shocking because I couldn't imagine anybody outside walking with their baby in the cold like that with no clothes on," the female witness told ABC.

The woman and her husband reported the sighting to police that morning, and the female witness said she was interviewed four times since.

Among other revelations in the affidavit:

--Officers searched all rooms in the house and the basement after being called to the home Oct. 4. Officers sought evidence but because the parents said the baby had been abducted, the only areas extensively processed for DNA and fingerprints were the baby's bedroom and possible entry points.

--The parents had told police that three cell phones were missing. The affidavit said a phone had since been found in a desk drawer, but that phone wasn't one of those reported missing. The missing phones haven't been found.

--Interviews with people involved in the case revealed "conflicting information for clear direction in the investigation."

Another document released Friday revealed some of what police recovered from the home during Wednesday's search: a comforter and blanket, some clothes, rolls of tape and a tape dispenser.

The family's local lawyer, Cynthia Short, did not immediately return a phone call seeking comment on the documents, and police declined to discuss what they found.

But before the affidavit was released, a statement issued by Short's office insisted the parents had no role in the disappearance and disputed claims that the parents aren't cooperating with police. The statement said the parents have consented to "unfettered access" to their property and allowed police to take hair and other samples.

"They have taken all calls from detectives, and answered questions posed again and again," the statement read. "In the initial hours of the investigation, they tolerated accusations, volunteered to take polygraph examinations; continued to work with detectives even after the interviews turned into pointed accusations."

Newscore and the Associated Press contributed to this report.