Unannounced to date, but this office probably has the info:
FCPD Public Information Office
4100 Chain Bridge Road
Fairfax, Virginia 22030
703-246-2253
Director: Captain Dorian B. Portee
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for good info, try:
Free online FCPD scanner feed
http://www.broadcastify.com/listen/feed/15175/web
FFx County Fire and Rescue scanner feed
http://www.radioreference.com/apps/audio/?feedId=1620
http://www.metro.co.uk/weird/78499-cops-use-chopper-to-buy-doughnuts