Encryption can be turned on or off at will. By a dispatch operator globally or an officer/deputy/trooper on their own radios.
Strategic Air Command did it during the Cuban Missile Crisis in the 1960s, when General Tommy Power wanted to ensure that the Soviets and Cubans heard his "all call" to the troops to show how serious the US was.
Be very cautious and critical when you read, listen to, or watch news stories from ANY media. They are rife with inaccuracies, conjecture, and may well be pushing an agenda. Journalism programs in many universities are where many of the marginal students flock to these days.Look for words like could, might, perhaps, infer, possibly, likely, suggest, unknown, ambiguous... these are all words that signify that the writer does not know and may be falsifying or leading consumers to believe what is truly unknown or pushing an agenda.
I've been on many crime scenes in my time and not one of them was ever entirely and accurately reported. Some mistakes were genuine mistakes and some were so slanted it was obvious.