gliving
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Not all sex offenders or violent criminals get caught. Plenty of repeat offenders are out there who remain free to re-offend. Databases are full of "cold hits", which means DNA matches another unsolved crime but does not match a known person. BG could be one of these.
Or no DNA because a condom was used. I don't think this is likely, but serial rapists will try to hide the deed. Including personal grooming.