What forensic technic can open a case from 20 years ago?

One forensic technique that can reopen a case from 20 years ago is DNA analysis. Advances in DNA extraction and profiling methods allow forensic scientists to obtain usable genetic material from old or degraded samples, such as hair, blood, or skin. Additionally, the use of familial DNA searching can help identify relatives of potential suspects, providing new leads in cold cases. This technological progress can lead to breakthroughs in investigations that have remained unsolved for decades.