Fortunately, it doesn't take long for Horatio to reassert himself on his turf. We see him all dressed up in a radiation suit, talking to someone on a cellphone and saying, "Okay, let's get the CDC to quarantine the crime scene until we know what we've got. Right." Alexx is pulling on her suit, so we can assume she just got out of the shower too. Let us all hope it wasn't an Enterprise-style shower. DeSoto tells him, "You two are negative." Horatio asks, "This means we just need to contain the contaminated evidence, right?" DeSoto adds, "And clean the dirty air. This will tell if it's nuclear, medical, or right out of the ground." Horatio's moved on: "Let me ask you a question: could you administer radioactive material by syringe." DeSoto says yes, explaining, "Radiation therapy. Attacks tumors." Alexx realizes, "Junkie mistook a syringe full of radioactive isotopes for narcotics." DeSoto points out that this is entirely understandable: "It's not like it glows or anything. The syringes aren't marked 'junk' -- he could have mistaken it for anything." We then flash back to Carl holding the syringe and saying wildly, "What's this? Some grade-A smack? I just won the Lotto!" Putting aside for a moment the observation that Carl's Method portrayal of a junkie evidently came from watching one too many "Just Say No" commercials during the 1980s, let's pause to reflect on how Carl is not one of those ingenious junkies, as he's assuming that large, unmarked syringes carried by small, skulking people must contain something good and not something lethal. The entire set-up is a howler. Plus, if the person who's carrying the radioactive syringe knew anything about its contents, wouldn't they have been content with letting Carl kill himself via a lethal dose of radiation, and not gone to the bother of snapping his neck? I can't keep thinking about this -- I'll just get cranky with These Killers Today and how harebrained they are. The scene ends with everyone in the radiation suits striding around purposefully.
Meanwhile, outside, Speedle frets to Calleigh, "Delko's definitely been exposed." She frets back, "Yeah, but to what? There are hundreds of types of radioactivity." Speedle's already thinking about this in terms of classification -- or, for the folks at home, in terms of exposition: "Well, it basically breaks down like this. Say you have a pencil. You put that on your skin, that's gonna wash right off, because it's an alpha particle. It's got little radiation. You got a pen, it has more energy, so it's going to sink into something. Then you've got gamma, which is totally toxic." Except for Bruce Banner, who was left only with an inconvenient case of split personality. Calleigh sums up for those us who are now wondering if all our writing implements are radioactive, or if Speedle's metaphors just leave a lot to be desired, "So we don't know if it went on Delko, in Delko, or through Delko." And then Speedle confuses things again by reciting, over a silly TMIcam X-ray shot of Delko, "Alpha, beta or gamma. Delko could have inhaled it off the money and not even had a clue." Calleigh looks over at Delko in alarm, and we see Delko now looking a lot less calm and confident than he had been a minute before.