Probably just hearsay :
I'd like more proof as to if it was true though.
The person who it happened too is a local guy, why would it be hear say, trust me it wouldnt be difficult to cause a slip hazard and custy to fall on it, especially those who pole shop fronts and around the front door 
I said hearsay because these things always happen to a friend of a friend.
If it was really as bad as you were told then there would be local news stories/papers etc, please provide any links.
I know it would be easy for it to happen I'm just saying "how the hell can they convict you"
So links to the offence would be nice.