SEPARATED: This 2006 file photo shows a border fence that separates the U.S., left, from Mexico in downtown Nogales, Ariz. A spate of drug-related killings the past few months in Nogales, Mexico, is keeping some residents in its U.S. sister city from crossing the border.
By Mark Scarp, contributing columnist
Guest Commentary by Andy Warren, Maracay Homes
Guest Commentary by Michael Carroll
Guest commentary by Phil Kerpen
By Mark Heller, Tribune