Im not sure if most police officers today carry a 9mm or something bigger such as a .45 but I do know the army switched to 9mm in order to use the same caliber NATO uses. The thing is, its important to use a caliber that has good stopping power. Im not sure if the officer in this video was using a 9mm but he needed something bigger, and he might've been better off with a revolver since they don't jam as easily.
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