Sporting teens in crime link.
The study by psychologists at Glasgow Caledonian University found sport can reinforce aggressive behaviour rather than act as a diversion.
They assessed 169 pupils aged 14 and 15 from Glasgow and discovered sporty teens were two per cent more aggressive than those who did not.
And sporty boys were four per cent more likely to get into trouble with drugs, fights and truancy.
Dr Jodi Burton said: "A significant correlation was found between participation in sports and aggressive behaviour."
But Det Chief Supt John Cornochan said sport was a way of diverting teens from crime.