I'm not sure if Coles is rolling out their new loss prevention technology Australia wide or just in some areas profiled as being dodgy.
In our local stores, if I enter to browse and/or do price comparisons and try to leave without purchasing anything, I have to ask permission to be allowed out which I find demeaning and embarrassing. This is a first for me, not being free to leave a market empty handed without having to explain myself. What's next, being frisked, or detained?

They are
Why is that? Just ask the person to open the gate, you didn't have what I wanted. Life goes on.