A LEO is not likely to be concerned if you have a partially loaded mag absent some other circumstances. I have seen plenty of dirty guns, mixed bag and grubby ammo, guns with 3-5 rounds in the mag etc on warrants, zero tolerance ops, etc. Being on forums like this skews your view: most people carrying guns, CCW or otherwise really don't care about the gun or ammo. They may shoot it once when they get it (or not) and just expect it to go bang. They may only ever have the rounds that came with the gun, or that they could scrounge from acquaintances, and if they ever fire the gun they may not clean it or even know how.
Goes for many LEO's as well. I've seen guys who have been carrying a .40 loaded with 9mm between shooting quals (we use both calibers) , and others who clean their guns every 2 or 3 sessions.