The Proprietary Association of Great Britain said the results might not reflect the real-life situation because the researchers looked at only 100 children over one night.
"While Call of Juarez: The Cartel touches on subjects relevant to current events in Juarez, it does so in a fictional manner that makes the gaming experience feel more like being immersed in an action movie than in a real-life situation, " a Ubisoft spokesman told Reuters news agency.
While Google chose not to take advantage of the situation to show the unicorn Nexus to the world, real-life units have been discovered floating around Moscone West.