Grissom: This better be good, Dave.
Hodges: I-I found a common element in all four miniatures. Bleach. There's a bottle of it in the trash at Izzy's, there's a barrel of it at the chicken plant, there's uh-uh bleach in the water at Barbara's condo, and now... A bleach coupon in Penny's. This-this may sound crazy, but if the killer is a housekeeper, or a janitor they would certainly know the ins and outs of each location. Uh, what goes in what drawer, what book on what bookshelf, hours of operation, habits, schedules. I've thought a lot about the killer's pathology, and there doesn't seem to be any regular interval between murders, which makes me think that they're being triggered by something. Maybe... Maybe the killer is triggered by bleach.
Grissom: The bellows.
Hodges: I'm sorry?
Grissom: James Tilly Mathews. Early 19th century London. Mathews was in Bedlam hospital awaiting trial. Doctors were trying to determine his sanity. Several interviewed him. Half thought he was sane, half insane. Turns out he was perfectly normal, except when someone mentioned politics. At that point, he'd go into a rage about the little men who lived underground and used a bellows to push thoughts into his mind, as well as the minds of Parliament, and the Queen. A specific object or word triggers the urge to kill. That's a form of delusional psychosis. Rare, but it does exist.
Hodges: If the killer is one of Ernie Dell's foster kids, maybe bleach played a roll in some sort of childhood abuse. He's getting back at the world for what they did to him.
Grissom: Well, if having bleach in your home is the common element among victims, huh, then anyone could be next.