http://www.medicalnewstoday.com/medicalnews.php?newsid=32043
"'Low impact' policing is the key to overcoming 'hooliganism' at major international football tournaments, according to ESRC-funded research. It found that while preventing known troublemakers from travelling is important, the way to foster incident-free events is a 'low profile', friendly-but-firm police presence, and dealing with fans on the basis of their behaviour not their reputation. "
