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reporter: what pattern does those specialists look for in dangerous packages? certain styles. patterns of writings on the face of the envelopes or the mailings. there are indicators of suspicious behavior that at least begins the suspicious inquiry as to what is going on here. reporter: he says whether it is discovered on the sending or receiving end, any suspicious package is quickly and carefully isolated. a key question now, how would some of the mail bombs this week have gone through the mail system to their destinations without cancellation marks on the stamps? nader says those cancellation marks are done by machines, which aren t foolproof. it may not show up at all if it goes through a machine, not the rye dimensions. reporter: post office officials say it is not just the postal inspector police now on the lookout. some 600,000 postal service employees across the u.s. are now in effect investigators. are they in danger for possibly more bombs still in the system? if