Can't say I know 100%, but it would normally depend how you structure your Designated Work Groups (DWG's). There are probably some guidelines around how you do structure this, however some considerations include nature of the work (can be same across states), type of office environment (corp. buildings are generally pretty similar I'd think) and number of people in that work group.
As long as each employee was covered through an accountable structure and part of a DWG somewhere along the line, it's possibly OK. But if you set up a completely inappropriate DWG (i.e. manufacturing workers in QLD in the same group as office workers in NSW) then you might leave yourself open to consequences.
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