The case of Oakland cop killer Lovelle Mixon is raising new questions about the California parole system, which critics say does a poor job of monitoring offenders once they leave prison, the Los Angeles Times reports. Mixon, 26, spent much of the last decade cycling in and out of state prison. His last stint ended in November, when he was released on parole. By the time Oakland motorcycle officers pulled him Saturday afternoon, he was a wanted man again — this time for missing numerous appointments with his parole officer. There are more than 16,725 people in California wanted on various parole violations.California Attorney General Jerry Brown, a former mayor of Oakland, said authorities have long struggled to monitor the movements of parolees like Mixon — violent offenders with a pattern of committing new crimes. “I think that’s one of the darker secrets of the whole prison industry, that the [] people who are let out are not well-supervised in many cases, although not all,” Brown said. “The supervision isn’t there. The surveillance isn’t there. The job training and preparation is not there.” Officials fear the problem will get worse if budget cuts cause the release of more inmates from jails and prisons. There are about 122,000 parolees on the streets in California. About 12 percent of them have violated the terms of their parole and are considered at large. Warrants have been issued for their arrest, but many will remain on the streets for weeks and months. The parole officer handling Mixon’s case was responsible for 70 parolees, 18 of whom were classified as high-risk