“Chelsea’s Law” was signed into effect on September 9, 2010. Codified as AB1844, the law becomes one of the toughest in the world for sexual offenders. Most punitive perhaps, is its “one strike and you’re out” element or a provision that allows a life sentence without the possibility of parole for an adult defendant who engages in even a single act of forcible sexual conduct against a child 14 years old or younger.
Other provisions require lifetime parole for violent sexual offenders, GPS monitoring as part of that parole and lifetime prohibitions against entering parks where children could play.
The Orange County Criminal Lawyer Blog

