Lab, Peters most likely quit his job or at his own request was transferred to work elsewhere. Laboratory Technician Nicole Talcott (Kimiko Gelman, season 3): A lab tech from the night shift of the Miami Dade Crime Lab. She temporarily filled in for Valera after the latter was suspended for putting a rape victim's DNA and profile into the system. Audio/Visual laboratory technician Daniel "Dan" Cooper (Brendan Fehr, seasons 4–6): He believes a great deal of information can be discerned by what music a person has on his or her MP3 playlist (episode 5.17, "A Grizzly Murder"). He had a good relationship with the Crime Lab personnel and also the CSIs until the season 6 episode "Bang, Bang, Your Debt", when he is discovered to have stolen and used a credit card that belonged to the late Tim Speedle—to the outrage of Delko and Calleigh, who told him to turn himself in or she would issue a warrant for his arrest. Presumably, this instance of identity theft was the final nail in the coffin for Cooper and ended his career at the lab, prompting him to resign from the lab for good, in disgrace. As a result, he holds a personal grudge against Calleigh for this, despite the fact that she does not press charges, and steals the flashcard out of her camera at a crime scene to put the pictures on a website he has created to "take her down a notch." He also changes her cell number and posts it on the site, and she is kidnapped from a "lead" (episode 6.16, "All In"). After an enraged Delko confronts him, Cooper later feels remorseful and turns in evidence that helps the team track down Calleigh, free her, and arrest her kidnappers. Laboratory Technician Jim Markham (Joshua Leonard, season 4), Ballistic lab tech. Markham became the head of the ballistics section when Calleigh left after John Hagan committed suicide there, but unfortunately, Markham made regular mistakes such as leaving skin cells unexamined on a bullet casing. Calleigh later grew tired of Markham screwing up and returned to the Ballistics lab, which also resulted in Markham being transferred elsewhere. AV Technician Dave Benton (Wes Ramsey, seasons 7–10): Audio/visual tech for the Miami Dade Crime Lab, who is a rock-star type of guy. (Ramsey had previously appeared as Kip Martin in the season 1 episode, "Spring Break".) Laboratory Technician Michael Travers