[Cryptography] jammers, nor not

[John Denker]

On 02/27/2017 02:14 PM, Henry Baker wrote:
> jamming devices will become *essential*.

Just in case it wasn't obvious, jammers are illegal in the US.

IANAL, but the last time I checked, there was an exception for military
and Federal law enforcement, but not state or local.  Don't bother
asking for an exemption; there is not even a process for granting one,
no matter how noble your purpose may be.

a) I reckon you can use a scanner so you can detect and confiscate any
 transmitters if/when they are brought in.
b) I reckon you are allowed to turn your home or office into a Faraday
 cage.
c) OTOH there is zero tolerance for active jammers.

See e.g.
  https://www.fcc.gov/general/jamming-cell-phones-and-gps-equipment-against-law
and references therein.