 Since the 1990s , there has been a marked decline in crowd trouble at matches , as a result of stricter policing , CCTV in grounds and the advent of all @-@ seater stadia . In 2007 , the club launched the ' Back to the Shed ' campaign to improve the atmosphere at home matches , with notable success . According to Home Office statistics , 126 Chelsea fans were arrested for football @-@ related offences during the 2009 – 10 season , the third highest in the division , and 27 banning orders were issued , the fifth @-@ highest in the division . 
