And you thought this was going to be easy. On a standard porro prism binocular, there are two basic designs: the European "Z" style and the American style. Both look outwardly the same, but if you look closely you'll notice on the American style the objective lenses are integral to the body of the tube. On the "Z" style, they are screwed into the body.
This creates a weak link and can be knocked out of alignment easily with even a minor tumble. If a lens hits on the edge, chances are pretty good it's going to be time for a trip to the binocular doctor. Something to think about.
The Lesson?
If I suddenly found myself back in a patrol car, one of the first things I'd do would be to dig out a good pair of binoculars. From searching canyons for lost kids, to watching drug deals go down a block away, to reading a license plate in a parking lot or just watching the airplanes land during your lunch break at the local airfield, good binoculars can be fun and as reliable as a good partner.
I'd buy a pair that's medium sized, porro prism, American style, with moderately sized objective lenses (remember, don't get carried away there), waterproof, with individual eyepiece focus and it probably wouldn't hurt to get some of that cool rubber "armor" on them either. Prices? Expect to pay anything between $100 and $1,000 (or more) depending on how badly you spoil yourself. Also, the new generation of image-stabilization models can actually hold still enough for you to read a license plate while your partner drives. Honest.