I plan to be a police officer in the future . What martail art would be most effective for police work??

any thing that emphiscies boton training, Eskrima, kendo, taiho jitsu

I've heard Krav Maga is good.

Honestly, the best choice is Jiu Jitsu. You'll probably make the people in your department very uncomfortable if you escalate the use of force by try employing aggressive striking techniques, chokes, or weapons during your arrest and control classes.

doesnt sambo have a good history of being used in policie or military settings