Why don't cops carry window breakers?

I've seen so many video in which a cop is trying to break a window with a baton but it just ain't happening. Why not just carry one of those spring loaded window breakers? They are small, light, and literally built to serve that specific purpose.

Edit: my question has been answered and apparently a lot more people carry them than I would have been led to believe. Thanks for the insight🤙🏼

Edit #2: after further discussion it seems like the best options for breaking glass are either shatter balls, spark plugs, or bullets lol