Zincwarrior
Diamond Member
Happens all the time actually.Try shipping illegal drugs in the mail
You're now enlightened

Restrictions on State Power Over Postal Offices | Constitution Annotated | Congress.gov | Library of Congress
An annotation about Article I, Section 8, Clause 7 of the Constitution of the United States.
Can the Government Open Your Mail Without a Warrant? - Wirth Law Office - Tulsa
Federal law prohibits opening mail without the recipients permission, but law enforcement agencies use a variety of methods to find out what goes through the mail. In Kentucky, investigators illegally opened packages, then sought warrants to open those only in which illegal items were already found.