Snail Mail surveillance is lots older than PRISM, but it’s now computerized through the Mail Isolation Control and Tracking program. Postal Service computers photograph all the 160 billion envelopes processed in the USA each year. Law enforcement agents don’t need a judge’s approval to request this information.
“U.S. Postal Service Logging All Mail for Law Enforcement,” Ron Nixon, New York Times
“USPS Procedures: Mail Cover Requests,” Postal Inspection Service via NYT
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