Parole officers in California repeatedly failed in their supervision of the man who allegedly held a girl captive for 18 years, a report says.
Phillip Garrido is accused of snatching Jaycee Dugard in 1991, when she was 11, and fathering two children with her.
The report into the case says Garrido, who was on parole for rape, was wrongly classified as low-risk and inadequately supervised.
As a result, it says, many chances of discovering Ms Dugard were missed.
Ms Dugard was found in ramshackle huts hidden behind the house where Garrido lived with his wife, Nancy.
The pair have pleaded not guilty to charges of kidnapping and rape.
The girl had been snatched outside her home in the California town of South Lake Tahoe in 1991, and found in August at Garrido's home near Antioch.
He had been released from prison in 1988 after serving 11 years of a 50-year sentence for rape.
The report lists numerous lapses by the California Department of Corrections and Rehabilitation, including:
The report spoke of "systemic problems" in the parole system, and called for better use of GPS monitoring for parolees.
Garrido had been under parole supervision because of a 1977 conviction for raping a 25-year-old woman.
He was released from prison in 1988 and placed under federal supervision until 1999, when California took over, the Associated Press reported.
California corrections officials said they were working to improve the monitoring of released sex offenders.
"We obviously deeply regret any error that could have possibly resulted in the victims living under these conditions for even one additional day," Department of Corrections and Rehabilitation Secretary Matthew Cate said.
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