[New York Times - http://www.nytimes.com/2013/07/04/us/monitoring-of-snail-mail.html?pagewanted=all&_r=1& ]
WASHINGTON — Leslie James Pickering noticed something odd in his mail 
last September: a handwritten card, apparently delivered by mistake, 
with instructions for postal workers to pay special attention to the 
letters and packages sent to his home.
“Show all mail to supv” — supervisor — “for copying prior to going out 
on the street,” read the card. It included Mr. Pickering’s name, address
 and the type of mail that needed to be monitored. The word 
“confidential” was highlighted in green.-[Full Article]