[otrs] Allow customers to read other customer's tickets

Is it possible to allow one customer to read (or even, perhaps, modify) another customer's tickets? For example, we want all the customers who work in Department A to be able to read all other Department A customers' tickets, but not be able to read any tickets for customers who work in Department B. I think this may be possible using separate queues for each department, but is it possible when all the tickets are in the same queue? Thanks, A. Lewenburg