This is a very important point that you raise and if I may I would like to expand upon your post :
People do not realise just how much electronic tracking there is in our everyday lives and the footprint that we leave . Let’s take for example the obvious ones like public CCTV and residential / business CCTV and street CCTV , shop and bank and fuel CCTV, road surveillance CCTV to monitor traffic flow and speed camera CCTV etc The list is endless! Then there are tracking devices on the car if there is one , then there is the cell phone and text message/social media footprints alongside Pings
But - there are some footprints that we either don’t think about or are not aware of for example I own a luxury ( ish ) brand of car and I don’t have a key , I have a black plastic fob that I carry around which activates the car but without inserting it anywhere within my car console. Now when my car has a problem and I go to the dealership, this fob is inserted into their computer and it tell you every journey I have made and the status of the car throughout that journey, if the fuels low , if the seatbelt warning is activated, if any warning lights come on , if tyre pressure is low etc
I was gobsmacked just how much information that could be obtained and to be quite honest, I am a law abiding citizen but it scared even me , just how much we are being monitored. Then there is ANPR both mobile and static and lets not forget that it’s not only your cell phone that can be pinged and calls traced but LE can go to any mast and triangulate all mobile cell phones that ping off a particular mast at a given time and they can cross reference the data from this to any of the contacts in your phone and see if there are any patterns . So just from this you can start to see how many avenues are open for LE to look at. And then we have instagram and Facebook and WhatsApp and snapchat and Twitter and email and fit bits and apple watches and you start to get my drift .....
Edited to add: We have family Life 360 so that we can see where our children are and vice versa and my DH decided to turn his location permissions off
BUT although it does not now tell me his location in words, it does show him driving down the various roads and highways when he’s out and about. So another form of surveillance and if somebody was going to commit a heinous crime, they cannot possibly erase all their electronic footprints x