He's more helpful.
If you use a controller that supports time limits for an outlet being energized, you can then use that outlet to segment your network. You would do that by having that outlet power a switch or hub that would attach the external network and the internal network.
The advantage of that type of setup is that you have access any time that you need it, but you must actively acquire that access. If you don't trust your supplier with access to the switch, you guarantee that they have access only when you grant it to them.
I don't think actually transmitting a sound that is audible would be a great idea. That might interfere with the ability to match pitch.
Bluetooth earrings that transmit a non-audible vibration would be pretty cool though.
Wouldn't the Supreme Court have to rule for this to apply? Couldn't the DHS just accept this ruling and not appeal, thus keeping the status quo because the border is a national issue and this hasn't been ruled upon by a body with national jurisdiction?
Not necessarily. The ruling by the 9'th circuit applies everywhere that falls under the jurisprudence of the court. If the DHS appeals, they can probably keep the status quo until the SCOTUS makes a ruling.