Repost
The last two nights saw these over DC- Did not see the "sniffer" on ADS-B
N22PP National Park Service Police helo
USAF 92-0372 Fairchild Metro "earbuster"-Yellow Trace
LIMO120 C-560 Blue/Green trace (purported to be a DOJ AC-see Cap#4 with perhaps a Stingray loaded on it to intercept comms-Cap
Stingray: A New Frontier in Police Surveillance
https://www.cato.org/publications/policy-analysis/stingray-new-frontier-police-surveillance
G20632 US Army Blackhawk over Minneapolis just north of the Int'l Airport