What martial art is best for cops?

So I’ve been thinking lately I might want to become a cop once I finish highschool. I’m going to be getting into some police sciences courses and stuff like that but I was also wanting to take up some martial art. I need one thats good for subduing someone, or disarming them if they have a weapon. I know the police teach you their own self defense style but I want to go into it with some experience, I mean you can never have to much right?

So what kind of self defenses do you know of? If you wouldn’t also mind listing their weak points and strong points and what all the main concentration of the art is on? (IE Holds, kicks, punches.)

Thanks =)