What would that have to do with it?
And actually, as far as forensics goes, there are many, many newer things than DNA being used now. DNA has been used for over 20 years now.
DNA testing should be MANDATORY for any and all major crimes, both current, and older. What would be the problem with actually proving the facts? Some DA offices are reluctant to use DNA. These are idiots, only afraid that they are going after the wrong person. And they are only interested in their public appearance. Some don't want DNA used because it would show that they convicted the WRONG person. They would rather an innocent person sit in jail, that admit they made a mistake.
DNA testing should be mandatory. PERIOD.