Steve Held, a reporter for Unraveled Press, lives on the northwest side.

I opened up ADS-B Exchange and, um, yeah, I was surprised to see actually there was nothing there.

So it didn't show the helicopter over my house at all.

So they will, um, turn off their transponder when they're on operations, and so they actually stop broadcasting this information.

So they're essentially stealth on the app.

Was it the Department of Homeland Security?

It's almost certainly a DHS helicopter.

[laughs]