Took the class, got the cert

Heard it in the class, and before, that it is wise to carry factory ammo, and even the ammo carried by the local cops in case there ever is a shoot.

In particular, what does Denver PD use?
In general, what does the State Police use?

I thought between the two I'd find one I like. Looking specifically for 9mm, but might carry 40SW and 45ACP from time to time.

I did some searches, but couldn't find anything?

Thanks!