If the guy has a high degree in Criminology, I think he wouldn’t have a cell phone on him, though.
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He’s a PhD candidate in criminology, so I would agree with you. If this is the case, did he also wear a plastic suit and booties on his shoes, ala Dexter? He understands DNA after all.
But his suit was ripped by the defenses of his victims. He didn’t count on that. Then later, he thought even that was ok, since his DNA was not in any police database. He drove home and parked his now contaminated car in his parent’s driveway - no problem. They can’t catch me!
But the cops didn’t use only police databases, the also used the genealogical databases to match his DNA. Viola! A match to his family which, together with his nearby location to the murder scene, pointed the detectives in his direction.
“also used the genealogical databases to match his DNA. Viola! A match to his family”
Yes. That happens frequently now. That’s how they caught that serial killer in CA after 30 years or so. Family members in 23 And Me or similar put them on a path to him.