Semantically, it could really go either way. If I 'carelessly' broadcast a letter via the US Postal Service to my grandmother in Hawaii, I have no way of ensur

Semantically, it could really go either way. If I 'carelessly' broadcast a letter via the US Postal Service to my grandmother in Hawaii, I have no way of ensuring that its secrets will be preserved in the long journey between my house and it destination. Similarly, if someone forged a USPS mailbox, placed in front of the post office, and I 'carelessly' dropped my letter in, then by your interpretation, I am a damned fool. This isn't an area where I'm particularly savvy, but if a private citizen were to stand up one of these mailboxes, it would be a federal crime. I understand that the corollary is not identical, and I agree that it's hard to parallel technologies to their real-world counterparts, but if a private citizen set up one of these towers, they too would be charged with some kind of wire fraud. In the absence of a warrant, I see no reason the government should have any elevated privileges here.