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“Reasonable“ it pretty tricky to define in the moment
The jury will take account of the short amount of time you had to consider the matter and the amount of stress you were under when determining the reasonableness of your action.
no item is worth getting slashed with a crankset
That's my view too - while you're allowed to defend your property, it's unlikely to be a wise use of your resources.
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“Reasonable“ it pretty tricky to define in the moment, as reasonable for the employee might not be reasonable to the bystander or a jurymember who wasn’t there.
Juries are almost invariably very sympathetic towards people who defend their own property. It really is only the Tony Martinesque outliers - shoot a thief in the back with a double-barrelled shotgun as he's running away - where they tend to lose sympathy. It'd be nice to think we could rely on the police to enforce law and order, but sadly that is no longer the case.
Once a shoplifter has made no attempt to pay, or left the store with an item, he/she can be detained by staff. If he is a brick shithouse then you may use such force as is reasonable to do it. REASONABLE!
With regard to the filth, they are a shower of shit. Report the crime and get a crime number then place a complaint re the handling of it. Gather any CCTV and tell them you have some. They'll be shit. Next time, if there is one, "he has something pointed" gets a better reaction especially if you hang up.