Well because...
The big problem is that in order for it to be used it must be in plain sight. Because by the time that officer one is by your car door, his partner has his gun drawn and trained on you.
I got pulled over in Phx one night because the cars tail lights were out. A simple fix it ticket. Before, when I got pulled over I would get out of the car and lean against it. But the last time that I did that (expired registration) the cop told me it was unwise and that I should remain in the car with my hands on the wheel.
So that was what I did after I pulled over. I was waiting for the officer to approach the car. I was looking in the rear view mirror and I saw that they both officers got out of the car, the one on the passenger side drew his weapon and directed his spot light towards me. The driver was approaching slowly but he didn't draw his weapon just had his hand on it and it was clear to me if I made any movement he would draw his as well.
As it turned out, the reason that they did it was that I didn't respond to their PA system and they had no clue as to what I was up to. When I explained that I was deaf, first he didn't really believe me because I didn't really loose all my hearing till later in life. Then he saw that it was marked on the Drivers Licence and he was wondering why I didn't get the HC plates for my car.
I told him that it seems to me that getting those plates would essentially be a form of advertisment for any predatory member of our species that here was an easy mark.
In any case, If I did have a notepad and pen in my car there would have been no way that I would even think of reaching for it under the circumstances.
