"Mr. Garrido, who had been convicted of kidnapping and rape in the 1970s, was listed, as required, on California’s sex-offender registry (complete with a description of the surgical scar on his abdomen and his 196-pound weight) and had dutifully checked in with the local authorities each year for the past decade — all while, officials say, his victim and the two children he is accused of fathering with her were living in his backyard.""Sex offender lists have made far more information readily available to the public and the police than before, but experts say little research is available to suggest that the registries have actually discouraged offenders from committing new crimes."
"And some experts say that the lists may lead people to presume that anyone registered must also be elaborately monitored, when, in truth, monitoring ranges enormously from place to place and state to state. In some cases, it amounts to little more than an offender mailing a postcard with his address to a police department once a year."
"The sheer numbers of sex offenders on the registries in all 50 states — an estimated 674,000 across the country — are overwhelming to local police departments and, at times, to the public, who may not easily distinguish between those who must register because they have repeatedly raped children and those convicted of nonviolent or less serious crimes, like exposing themselves in public."