I am a fan of long-distance cycle touring, (and cycling in general)and the number of times that I've almost been hit (AND been a victim of a hit & run) is too high to count. I've done things like place a laminated info-sheet with my name, address, DOB, blood-type, etc. in my panniers in the hope that it would help identify the body if it ever came to that. I realized however that emergency responders probably won't find it, or won't look at it if they do find it.
So I got a tattoo on my chest with name, DOB, blood-type and Drivers License number.
These are 2 pictures, one showing a bare-loadout (activity: grocery shopping)
https://photos.app.goo.gl/kq3rhXV6daFDtSVL8
And this is a a medium touring load-out:
https://photos.app.goo.gl/fXgfsRWf8RCLPeTN8
I think you could see why I assume a cop might never find emergency information.