do not supposedly encrypt their radio traffic.
Go figure(there are some pretty sane reasons) ! Same seems to be the case with US too.
In many countries, listening to most radio communication is not a crime (US has an exception for cellphone frequencies). It is also not a crime in many countries to provide frequency, modulation and related information about radio communication made by anyone. Using the information for criminal purposes is a crime in most countries. Publishing the information obtained from some communications (some frequency bands) is a crime in some countries. But merely listening to it is not.
FWIW, in India, it's a crime to even listen to such unencrypted traffic.