There was no (space for) discussion of methodology in the article. In reading about these cases one should keep in mind that a forensic DNA test does not unique

There was no (space for) discussion of methodology in the article. In reading about these cases one should keep in mind that a forensic DNA test does not uniquely identify an individual, and, if it's used to match for someone in a large database, you must beware the epidemiological fallacy. It's also possible that what appears to be a single "serial rapist" may be more than one criminal.