Wired has a great story about a compromised surveillence operation. Seems they were tracking American born Yasir Afifi's vehicle using an Orion Guardian ST820 tracking device made by Cobham when he discovered the unit after he brought his vehicle in for service.
The kid's friend posts photos online asking for help identifying the strange object and within days agents arrive to demand its return. It's a good read.
Read More: http://www.wired.com/threatlevel/2010/10/fbi-tracking-device/#ixzz11nDkRECp