Prosecutors in Southern California plan to offer free DNA tests to some prisoners, even though the results might overturn convictions. The USA Today newspaper said in today’s editions that San Diego County prosecutors have been reviewing the cases of about 560 prisoners since June to determine whether DNA tests developed since their convictions, all prior to 1992, can be used to link biological evidence from a crime scene to someone other than the person convicted. It said the county plans to pay for tests in such cases at a cost of about $5,000 each and that it would the first program of such free tests in the nation.