An example of the instructions given to security staff: [[BJC 2008 Security Procedure]]
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BJC 2010 hired a security company that specialised in festivals (rather than night clubs or building sites, for example). This meant that they were more familiar with the atmosphere expected at a BJC. They understood how to be understated and friendly, they were comfortable with "alternative" people, and familiar with the kind of teen drinking / drug taking problems that need to be resolved sensitively but firmly and quickly.
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Some security situations may require a team member to make a decision. If a paying customer (or trader) is found starting a fight, harassing people or endangering the convention with illegal behaviour, you have to decide whether to throw them off site.