GUN-TOTING DOCTOR'S BEHAVIOR CONCERNS CARTER WHILE WEAVER CONCEALS SECRET

When Dr. Pratt (Mekhi Phifer) is caught bringing a gun into the emergency room, Dr. Carter (Noah Wyle) feels compelled to defend him -- but his colleague's erratic behavior makes even Carter have second thoughts. Meanwhile Dr. Weaver (Laura Innes) hopes to keep her pregnancy a secret, but physical complications might compromise her plans. Elsewhere, Dr. Lewis (Sherry Stringfield) keeps a wary eye on a self-destructive patient (guest star Rob Moore) who admits to molesting young boys; a guilt-stricken Dr. Kovac (Goran Visnjic) is warned by Dr. Romano (Paul McCrane) not to admit his fault to the grieving relative of a patient he treated; Dr. Chen (Ming-Na) treats some student math whizzes who overdosed on Ritalin; and Dr. Gallant (Sharif Atkins) confronts a scheming young wife (guest star Sofia Milos) who has designs for her dying husband. Maura Tierney also stars.