I know I am late to the ball...but I've seen this argument many times and have remained mum. Simply stated, and this is not an all-encompassing argument, but I was always intrigued by the statement going something like this, "...we have had many suspects CAUGHT while listening to scanner apps on their phones."
I find this simply hilarious. On one very extreme, is the over-confidence of being able to "listen-in" on the police giving these would-be expert criminals a false sense of bravado and security? The joke's on them if they believe all police communications are transmitted through normal dispatch channels. Many agencies heavily utilize MDCs, Tactical channels and cell phones. Or is it that most of these people are too stupid to hold down regular jobs and any tool available to them is beyond the reach of their comprehension? So I ask the question, are smart phones leading to more arrests? This may be difficult to answer, because we NEVER knew how many people were/are getting away by listening to scanners in any shape or form to begin with.
The real questions is...can ANYONE prove, based on acceptable metrics, that crime has diminished through the long term use of encrypted communications or was it just a knee-jerk reaction to "hey these guys can hear us" syndrome? Certainly, there are several agencies (most of them federal) currently utilizing encrypted comms, but can any of them prove that encryption works and that concerned citizens should be devoid of any and all of their communications?
Before the recent advent of scanner apps for smart phones (at least the phones are smart), how many criminals were CAUGHT listening to hardware receivers? One can safely argue that programming today's hardware scanners is proving to be more and more difficult and that scanner feeds offer a viable solution. However, you still need to LEARN THE LANGUAGE. Many LE agencies still use a Chex-mix of codes and signals to communicate with each other. It literally can be a second language and can take weeks or months of consistent listening to become "fluent". Not to mention that for the travelling criminal, these codes often vary widely from county to county.
Many, if not most, criminals are committing crimes under the strong influence of drugs. Additionally, they probably have adrenaline pumping through their veins as well. This compounds the problem of connecting what you are hearing to any sort of coherent thought. A series of "DUHS" running through their initially feeble minds would be an understatement.
So, in terms of the criminals' minds, scanner apps do solve some initial problems. But in the end, their smart phones haven't made them any smarter.
On a quick side note, I run a local feed, and I've noticed that the longer the scanner app stays active, the longer the delay becomes. I'm no IT expert but I suspect some kind of mix of gibberish like network latency, buffering, etc. is to blame. In a 24 hour solid period of listening, the latency had increased to over 15 minutes. This certainly isn't a solution; strictly an observation.