I can't imagine how bad it would be if their hit by a double whammy of dwindling supply and increased prices.
I'd prefer that the civilian police have plenty of avaiable ammo for training purposes. They should know how to use their duty weapons effectively.
But I'd hate to see it get to the point where someone declares that any ammunition seized in an arrest can be treated like private property in a drug-raid....i.e. can be used or sold at the police's discretion. We don't need to provide an incentive to seize extra ammunition on suspicion.
"You've got how many rounds of 9mm stockpiled? That borders on mental instability! We're just going to cart some of that away while you appeal the action to a judge....."