A criminal defence lawyer isn't sure changing trespassing laws will significantly impact retail crime. 

The Justice Minister's latest law and order proposal would double maximum fines for trespassing on businesses. 

It will also let owners ban people from multiple sites - and for longer. 

John Munro says the move, alongside an earlier announcement on harsher moves against shoplifting, won't make much difference.

"Most of those sorts of people, I would think, don't have much money in the first place to end up paying a fine - does it really deter them?"

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