There are exceptions to the rule, central to the British approach to law, that everyone is innocent until proved guilty.
Countless generations of children would tell you parents and teachers have not always observed the principle. Even in courts of law, there is one glaring anomaly: newspapers, magazines, TV etc have to prove their innocence if sued for libel.
Now there is another category of exceptions: supporters of Sunderland football club suspected of being involved in violence in Newcastle while returning from the pre-season friendly at Hearts. Season tickets have been suspended, individuals removed from the crowd having gained admission to a match.