There are a great many freelance news photographers who, yes, obviously use scanners heavily. There's nothing wrong with it, but of course, it's only a tool. You can't simply call what you hear 'news' and relay it, you can only use it to go get the info/pictures yourself.
Anyone who has much experience with monitoring knows that 'what you heard' on the scanner is even LESS accurate than the typical mainstream media, which is saying something!
Of course, be aware that being a freelance news photographer is an expensive, complex, and difficult job. You'll be buying your own cameras, and for video, that's an EXPENSIVE camera for real news gathering. You'll probably need to buy your own 'turnout gear', the coat and protection firefighters use, for safety covering fires. You'll be driving all over your area. You'll most likely be doing it mostly late night, when the regular news crews are home sleeping.
Such is the life of the 'news stringer'.