[LonePalm]

What ever frequency is being used it would be available to any member of the public with the proper equipment and would have to fit somewhere on this chart.

U.S. Frequency Allocation Chart as of January 2016

WWG1WGA

Garde la Foi, mes amis! Nous nous sommes les sauveurs de la République! Maintenant et Toujours!
(Keep the Faith, my friends! We are the saviors of the Republic! Now and Forever!)
LonePalm, le Républicain du verre cassé (The Broken Glass Republican)

[WildHighlander57]

Lone palm is absolutely correct about the frequency allocations.

Now, receiving clear comms is another thing entirely; many LEO and sheriff depts have switched over to encryption.

(Tech slide:

But some haven’t, so scanners are still used:

https://www.thedrive.com/reviews/27907/best-police-scanners
)