ammunition

Question about ammunition. Do cops get to use their personal preference or do they have to use department issued ammo?

I live in FLorida, and most of the shelf's have been wiped clean, the AR's and AK's are now going for 3 or 4 thousand, when before they were 12 to 15 hundred. But I went to the store, during lunch and the guy there had an AK-47 for 800 dollars, I ran to the bank and drained my bank account to...