Los Angeles police flights cost $3k an hour, audit finds
theguardian.com
theguardian.com
Whether they overuse helicopters is a separate matter - no idea.
Police in the US act as if they are royalty. Above the law when the break it, sacrosanct when their budgets are questioned. The one thing I've notice is when they're not around, annoying behavior increases (littering, traffic, etc) but society seems to keep humming along and it doesn't collapse. I'll take the annoyances over their cost and bad behavior any day.
It looks like by far the largest cost is staffing. Followed by maintenance, fuel, and financing.
At the same time, the FAA drone rules website does lead you to "Are you a Government agency (Federal, State, Tribal, and Territorial law), law enforcement, or a public safety entity?" and the rules LAPD would follow to operate a large drone are not the same as a random enthusiast would follow to operate a small drone. If the hypothetical drone is over 55 lbs, they might be operating just under the heading "Public Aircraft Operations—Manned and Unmanned".
https://www.faa.gov/regulations_policies/advisory_circulars/...
And even if that weren't true, law enforcement is a government operation and it's very plausible to see them get permitted to do things an average corporation or individual isn't. For example, extra requirements for flying near airports that require specific capabilities and sensors in the drone and a special pilot license.
LAPD helicopters for everyone, they're cheap.
https://skybrary.aero/articles/see-and-avoid
We will see law enforcement using more small, lightweight drones that are subject to much looser FAA rules. Those are useful for short range searches but can't follow a car chase or scan a large area.