Holmes left his sweaters outside Watson's room and he insists on them being taken back to Main Moon Dry Cleaning. He's certain Benny is innocent, because he has no connection with the Lydons and there was that text they got just before Kademan was murdered. Possibility One: Benny's blood could have been planted. So what's Possibility Two? Holmes admits, "Possibility Two has stubbornly refused to reveal itself."

The dry cleaner's. Watson brings in the sweaters. Watson establishes that the woman understands English, but she doesn't speak it. Watson notes that the fur coat is still where it was, suggesting that the rack hasn't been rotated at all. The translator explains, "She say slow day yesterday." And there are six expensive cameras and two more at door. The explanation for that is, "They came when we buy place. Problem?" Watson leaves.

Watson bursts in on Holmes, but he's in the middle of several video conferences at once. He gets a lot of use out of those six monitors/televisions. He assures he doesn't have some elaborate Dry Cleaner plan. He just likes clean sweaters! Anyway, he's talking to the Top Geneticists. The new possibility is that law enforcement tests only 13 loci, and that's so few that you could fake it. Holmes got a sample of the blood from the scene for "a full workup." The 13 loci matched, but there were no other loci in the sample. None? Like, it's not even blood? Well, whatever happened, only a geneticist could carry this out. There's no shortage of them in this episode, but only one pointed the police at Benny.

Gregson is with Kademan's fiancée Paul. He works for UVN Pharmaceutical, which has the top lab in the city. Bell threatens to get a court order to check out the equipment. But Paul's boss gave them access to the lab and their people are checking it out already. It's a good thing that genetics labs don't ever clean any of their equipment, huh? Holmes asks why he murdered his fiancée. The reason is that he has the warrior gene, which says he's a sociopath. Kademan pulled away when she found out. She was "moving on and stepping out," says Paul. With someone named Lincoln Dunwoody. Last Tuesday, she cancelled their date on his birthday. According to him, this has nothing to do with inducing CAA. "I don't even know what it stands for," he admits. And I believe him, because I've also forgotten.