To initiate this surveillance, the department or agency has at least one hurdle to climb. First, they must submit the request in writing. Then … well, nothing. That is the entire hurdle.
Edit. Note: this is just the exterior of the mail that’s scanned.
Reminds me of this: The Post Office Is Spying on the Mail. Senators Want to Stop It: The USPS carries out warrantless surveillance on thousands of parcels every year. Lawmakers are working to end it—right now by Dell Cameron in Wired.
Edit. Note: this is just the exterior of the mail that’s scanned.