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Life and death assume an even higher profile as single-mother Sam treats an abused and newly pregnant teen as well as a wife who sees her injured family melt away after a car accident -- while Dr. Carter takes a holiday to show Kem the wonders of a wintry Chicago. Elsewhere, a risk-assessment expert is hired to observe the E.R. and is shocked at the abounding mayhem -- especially when Sam roughs up a patient's friend. Abby and Dr. Pratt restrain an undocumented man who wants to check out despite testing positive for tuberculosis while Sam is quizzed by her son Alex about her interest in Dr. Kovac.