A criminal defence lawyer isn't sure changing trespassing laws will significantly affect 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 - and most don't have the money to pay a fine in the first place.