I'm not even sure where to begin with this episode.
When did the CSI officers start referring to themselves as "CSI Duquesne" or whoever?
The episode starts at a horse race. The guy that gets killed is a horse owner. CSI is on the scene, and El Poseur (EP) is standing over the cadaver. There's the entry wound, but El Poseur notes there's no exit wound, which requires someone to state the obvious - the bullet is still in there. Thank goodness we have such astute people working to solve crimes!
Then the Jaw and the Smirker are in the room, gathering more evidence, the Smirker unnecessarily in a 3-piece suit. A little banter, and then they discover some truffles that the Smirker knows don't come in the luxury box gifts - they aren't from Miami... They are from Chicago, and the guy who owns the company happens to have a horse, as well.
A bunch of annoying crap happens, and they tell horse guy to stick around. While at the scene (where they questioned truffle boy), some short guy gets caught pulling used tickets from the trash - apparently, this equals messing with a crime scene in Miami - who knew? They shuffle the guy off; I didn't see if they got his name or not.
In the meantime, side story with Torgo helping a friend of his beat up some Russian mob guy - this happens to be the time that EP is bringing home some boy who happened to have CSI Torgo's card in his backpack - the boy's dad didn't pick him up after school, so he went to the track. EP draws on Russian mob guy, who proceeds to cut his throat with some broken glass.
In the meantime, Smirker and Jaw are talking to Cadaver's horse trainer, and while the Smirker is flirting, the Jaw is searching around, and just happens to find a bolt gun (which is what killed Cadaver, as opposed to a gun). So they bring trainer in.
While checking the towels for trace, Jaw notices some synthetic dirt, which had some stupid name. He didn't know what it was, but fortunately, a british lab tech happened to stop by to see what what going on. In a great break of luck, british guy knew what kind of soil this was, and knew that it didn't happen to be in Miami, and on top of that, he knew all six of the tracks in the US that had this crap! Wow. One of them happens to be in Chicago, home of Truffle Boy.
I really don't care about the Russian mob side story, but it seems to segue into something later on. I still won't care about it, though.
Truffle Boy happens to own a bolt gun, but is surprised when he sees it missing. In the compartment where it's kept, though, EP picks up a ticket with a winner on it. There's no trace on it, though, as Doe-eyed cop discovers, but there is a circle, which happens to match the circle made by the grabber thing that ticket puller guy was using. Using that as the entire pretext, they pull ticket guy in, take his hands, check for gunshot residue, find it, and get a confession from him. Seriously - the guy couldn't have gotten that from anywhere else? It wouldn't have washed/worn off while he was doing so much other stuff? And he confesses? Anyway, his excuse is that Cadaver duped him into believing the horse he sold cadaver was worthless. The guy was a jockey who put his life savings into this horse, knew it had "perfect" balance, gait, etc., yet was duped?! Come on, now...