Commentary on Sections Part 4: Sport Chapter 2 - Conduct at Regulated Matches Section 36:  Throwing of articles capable of causing injury
This section creates an offence of throwing any article capable of causing injury if it strikes a person at or towards a playing area or other specified areas without lawful authority. A person guilty of this offence is liable to a fine not exceeding level 3 on the standard scale. Currently a level 3 fine has a maximum value of £1,000.