Toxin (episode #22)
Originally aired: Friday November 25, 2005 on CBS

Writer: Ken Sanzel
Director: Jefery Levy
Show Stars: Alimi Ballard (David Sinclair), Rob Morrow (Don Eppes), Peter MacNicol (Dr. Larry Fleinhardt), Judd Hirsch (Alan Eppes), Dylan Bruno (Colby Granger), Diane Farr (Megan Reeves), David Krumholtz (Charlie Eppes)
All Guest Stars: Mark Harelik (Taylor Brindell), Nick Kiriazis (Rob Evans), Patrick O'Connell (Bill Yardley), Lou Diamond Phillips (Special Agent Ian Edgerton), Kristin Proctor (Sheriff\'s Deputy), Owiso Odera (Tate Gilliam), Elyse Mirto (Wife), Cynthia Preston (Mrs. McHugh), Connor Trinneer (Bob McHugh)
Production Code: 209


After four people nearly die from poisoning, Don learns someone is tampering with nonprescription drugs. When the perpetrator publishes a manifesto in a local paper, Don is led to believe the person may be a former employee of the drug company that manufactured the drug.