Effect Investigators News Today

>> 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 throug...

Patterns of writing 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: nader says whether it is discovered on sending or receiving end, any suspicious package is quickly and carefully isolated. a key question tonight, 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 the c...