According to one Mexican news article, businesses in Ciudad Juarez are forced to spend quite a lot for safety:
(...) businesses have spent more on security by hiring private guards, bulletproofing their vehicles, installing alarms…and demanding increased action in order to feel safe against so much violence. [ed. personal translation]
Despite an increased police presence the rampant violence in Mexico continues to be unabated; 23 people were killed in Chihuahua during a single 24-hour stretch last week while more people have been slain by drug gangs this year more than all of 2006 or 2007.
Sources (English)- AFP, Xinhua, The Australian, Radio Netherlands Worldwide
Sources (Spanish)-Puente Libre