There is a law in California that allows prosecutors to use previous statements from a victim, if the victim takes back the testimony in the future.
http://www.msnbc.com/news/995878.asp?cp1=1 However, I think that the new laws that the California prosecutor discussed are really about preventing "settlements" that interfere with criminal investigations.
http://www.thedesertsun.com/news/stories2003/state/20031121033408.shtmlProsecutor says law won’t allow Jackson to pay off accuser before trial The Associated Press
November 21, 2003
{...} "Sneddon baffled legal experts when he seemed to imply in a nationally televised news conference Wednesday morning that state law had changed since the 1993 case so that prosecutors could force minors to testify. In that case, Jackson’s alleged victim refused to testify against him after reportedly receiving a multimillion settlement from Jackson. {...} But Sneddon later told the AP he was referring to a change that allow prosecutors to intervene in a civil action and stop it, removing the monetary incentive for someone to wait for the outcome of a civil case before they decide whether to testify in a criminal trial." {...}