if you are accompanied by a police officer, does the person need any type of permit to shoot?

I do not remember seeing anything about police officers being exempt from needing a permit. I think you need a state gameland range permit or a hunting permit in order to shoot here. 1 guest should be allowed. You can buy a state gameland permit online for very cheap. You can double check on the state gameland website to be sure. Side note: there aren't usually people there enforcing rules so be your own RSO. Also, I've never seen a park ranger there checking permits or anything.

If they have a range permit, they can bring one guest. No range permit? Then they'll kick you off.