Donna L. Walker, who was held by Kansas authorities Friday in lieu of $100,000 bail, provided tips to authorities about child pornographers.
"Periodically, she on her own initiative would call us, and we would evaluate the information," FBI spokeswoman Beth Anne Steele told the Associated Press on Saturday.
Steele said the information was usually for cases outside Portland, so it would be passed on to other police departments or FBI offices.
Walker was known to regularly place such calls to law enforcement agencies around the country, Steele said.
Federal court papers say an informant identified as "Donna" frequently posed as a young girl to lure child pornographers out of the shadows of the Internet and turn them over to authorities in Arizona, California, Kentucky and Washington. Donna Walker was later subpoenaed as a witness, and federal officials as well as Walker have acknowledged that she was the informant, The Oregonian reported in Saturday's editions.
Federal officials also suspect that Walker, 35, set off a wild-goose chase in Oregon that prompted investigators to search for two missing Michigan girls in January 2002. They were eventually found in West Virginia, living with their mother and her husband, a convicted pedophile.
Confronted about the incident in later interviews with The Oregonian, Walker did not deny that she was behind the fraud. She blamed her lapses in judgment on multiple personality disorder.
"Like all criminal informants, you've got to separate the wheat from the chaff," FBI Special Agent Richard Davidson said Friday from Chico, Calif. "You know what issues she's got. But she does have some good information - or has in the past."
Walker first came to the attention of the FBI in Oregon in January 2002, the newspaper said.
On Jan. 27, dispatchers at a crisis hot line in Portland fielded a call from a man claiming he was thinking about killing himself and a teenage girl he was traveling with. A short time later, a girl's voice told emergency dispatchers that the man had kidnapped her in Michigan and that she was in a car at a McDonald's restaurant in Portland's southeast suburbs.
Sheriff's deputies searched several McDonald's sites but found nothing.
The girl told dispatchers she was 13 and gave the name of a 13-year-old Michigan girl who, along with her older sister, was reported missing from the Ypsilanti area. A similar call was placed the following day, and authorities again turned up nothing.
The girls were found the following day in West Virginia with their mother, who was charged with illegally removing and concealing them from their father.
The Michigan girls apparently were never in Oregon at the time of the searches, Steele said. Walker is thought to have been behind the hoax, she said.
According to The Oregonian, Walker has a command of adult and child voices - male and female. Before finally acknowledging her identity in interviews with the paper, she phoned The Oregonian in order to give news tipe, giving such names as "Stephanie," "Michelle" and "Brian." She has used similar identities with federal authorities.
These characters offered news tips that could not be corroborated, some of them involving high-profile Oregon murder suspects Christian Longo and Ward Weaver III.
"She's an interesting person," Special Agent Davidson told the Oregonian. "Maybe not in a good way."