@SueDiOh

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"It would be a shame if protesters started wearing safety glasses, hard hats, respirators, and gardening gloves, all of which can be found at the hardware stores. It would be a shame if they started using traffic cones (the kind without the hole in the top), upside down buckets, or other improvised lids to contain teargas by placing them over the canisters. It would be a shame if protesters learned that police scanners are legal to own in the US, allowing them to learn where police are moving, and what routes they intend to take. It would be a shame if they discovered that these scanners can be used to send as well as receive, allowing them to flood the scanner frequencies with noise. All of this would be a terrible, terrible shame. *It would be an awful shame if you copied and pasted this, so that they couldn't delete the original and all linked posts (again)."

@SueDiOh typical scanners do not transmit. Some transceivers can scan. Few will transmit on public service frequencies and such transmission is illegal without licensing. Jamming is illegal and you can be located. It is likely that DHS is using digital trunked systems like P.25 with encryption.

There are other ways to use radio that are more useful, in case you are interested.