A person, let's say Jane, owns a home and receives hundreds of toll invoices (see link) and automated traffic tickets. It is Jane's address but the names are strangers all over the nation (USA). Obviously the scammers are setting Jane's street address in the vehicle registration.
Jane calls local police to report this. The police figure out pretty quickly that this pile of letters is addressed to someone who does not live in the home.
Mail is Federal jurisdiction. Can Jane consent to letting the local police open up the letters to read the contents?
The addressee is actually Chuck, and through contents of the letter, they eventually catch and charge Chuck. If the contents of the letter are "the tree" that leads to "fruit" in the usual sense of "fruit of the poisoned tree"... can Chuck claim the search was improper and get it thrown out?
Jane and the police officer are in Florida and the mail is sent from the Florida DOT. Does that change the equation any?
The officer is a Hazzard County Sheriff deputy and the mail is addressed from the Hazzard County Sheriff's Dept. Does that change the equation any?