You're getting some mixed info.... read my response to the domestic mail search issue I posted a few days back....you still have to have a warrant unless the below applies...
Re: got A seizure letter need info.
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I deal with this almost once a week.. its a gray area...under "exigent circumstances" relating to foreign intelligence collecting... It was Senate bill 662....the wording was clear about still requiring a warrant to open any Domestic originating mail.....but it differed in Bush's signing statement...where he mentions exigent circumstances...and people being in immediate danger....
Its no different than getting into your car or home without a warrant under "exigent circumstances".....i.e..the police are chasing you and they see you enter a home with the murder weapon...they can come right on in...
Again....remember though... the bill was only relating to foreign intelligence/terrorist issues.
http://www.elitefitness.com/forum/steroids-discussion-forum/got-seizure-letter-need-info-550961.html