Those of us who worry about gun proliferation used to obsess about “the iron pipeline,” a.k.a. I-95, along which weapons were ferried from Southern states where they were easy to purchase to Northern destinations where they could be sold for a very tidy profit.
Now shipping through the iron pipeline is sort of like keeping in touch with all your friends and family by writing lovely letters on your personal stationery and taking them to the post office to buy stamps and put them in the mail.