Going to try to stay on topic.
I do find that often if a car is going too slow, seems unaware of surroundings, is weaving, the driver is holding a phone to their head. I have fussed at my wife, seeing how her driving degrades when she's on the phone.
When they made phone use while rolling illegal in certain parts where I drive, I installed a hands-free bluetooth radio, and it really does make a big difference for me. Even if I'm in a location where phone-in-hand is still legal, I hate it, as I can tell that it puts a blanket over my awareness, compared to the BT.
It took a friend of hers fussing at her for my wife to wonder if there was some legitimacy to my concerns about her rolling phone use. After her friend got on to her, she agreed to an aftermarket stereo for hands-free.
Hands-free sort of "separates" me from the phone. I can swivel my head, crane my neck, keep two hands on the wheel. the car gets priority instead of the chorus of movements required to spin head, phone, arm-holding phone, shoulder holding arm, twisting at the back while therefore leaning forward to twist. It becomes no different than talking with a passenger. the only difference there is, if I'm about to have to do a complex merge or something, I have to say "hold on", whereas a live passenger would see it and just be quiet.
As for officers that also break the rules. We can't say, "i'm not going to do it because they don't do it either." It's not about that. It's about public safety. Do what is RIGHT for you, and don't base your own bad habits on other people around you. I've experienced good officers and unprofessional ones alike, just like you have good students and bad, good [insert religion here] and bad. They have little bearing on how I try to conduct myself.
Be safe.