I was reading this article at BBC about the new microchip they intend to use at the World Cup next year. Do you think it's possible that such a system could be tampered with from the crowd to confuse the electronics into thinking a goal has been scored when it hasn't? http://news.bbc.co.uk/sport1/hi/football/teams/l/liverpool/4302894.stm
Couldn't they just stick some cameras around the goal mouth? Then refer to a *shock - no way* 4th official off the pitch.