NORTH OGDEN -- The search for missing Alexis Rasmussen has turned into a criminal investigation.
Rasmussen, 16, was last seen baby-sitting at the home of Eric and Dea Millerberg on Sept. 10, said her mother, and was reported missing the next morning.
Last week, the Millerbergs were both arrested on charges unrelated to Rasmussen's disappearance.
The Millerberg home, 3228 N. 900 East, was searched pursuant to a search warrant Sunday night.
Eric Millerberg, 36, was arrested early last week on a probation violation for the use of opiates, according to court records. He pleaded guilty to the violations Tuesday morning in 2nd District Court.
Dea Millerberg, 38, was arrested a day or two later by the Weber-Morgan Narcotics Strike Force and charged with two counts of forging prescriptions.
Dawn Miera, Alexis' mother, said Alexis had baby-sat for the Millerbergs about four times before.
The couple were going on a date that night, though at 10:30 p.m., Rasmussen accompanied Dea Millerberg to a Walgreens in Layton. Miera did not know what the two were picking up from the store.
As it got close to midnight, Miera told her daughter over the phone to stay the night because the Millerbergs still weren't home. But when Miera arrived the next morning, Rasmussen wasn't there.
She does not believe her daughter ran away.
"Something is really wrong. I know something's wrong. ... I know she would have called," Miera said. "I love her. I just want her to know that I love her."
Miera said the North Ogden Police Department informed her last week that the Federal Bureau of Investigation is involved in the case.
Weber County Attorney Dee Smith declined to comment when contacted Wednesday. North Ogden Police spokesman Paul Rhoades did not return phone calls seeking comment.
Neighbors of the Millerbergs, who asked not to be identified, said that about noon Sunday, North Ogden police patrol cars began watching the house from the street and remained there throughout the day.
About midnight Sunday, police entered the home with flashlights, and by 1 a.m. Monday, more than a dozen police vehicles were in front of the house, including some from the Weber County Sheriff's Office Crime Scene Investigation Unit, the neighbors said.
Police searched both inside and outside until after 3 a.m. Monday, neighbors said.
The search seemed to center on the kitchen area of the home, the concrete steps outside and the trunk of a Saturn automobile parked on the street outside, neighbors said. The Saturn was towed away with a police escort early Monday morning.
A separate search occurred Friday at the home by what appeared to be plain-clothes officers, the neighbors said. That search lasted several hours, and police left the residence with several brown paper bags, neighbors said.
Dea Millerberg's charging documents point to fraudulent use of prescriptions in May and June of this year. She has a status conference today before 2nd District Judge W. Brent West.
Eric Millerberg was on probation after serving six months in Weber County Jail last year on charges of credit card fraud and forgery. He was arrested by his probation officer early last week.
During a hearing Tuesday before 2nd District Judge Scott Hadley, Eric Millerberg admitted to using opiates in violation of the terms of his probation. Hadley set sentencing for Oct. 25.
Before Millerberg admitted to the probation violations, in answering questions as to whether he qualified for a public defender, which he did, he said he had no current source of income.
He said he had just refinanced his home, meaning no equity, and owned a 1978 Lincoln Continental.
Standard-Examiner reporter Michael McFall contributed to this article.