Is it legal to break a GPS planted by law enforcement agencies?

Michael H asked: Just like the headline asks. I was wondering if police or another law enforcement agency place a GPS on say your vehicle.
As in this cnn article:
http://www.cnn.com/2008/CRIME/08/18/gps.tracking/index.html
If you found it, would it be legal to disable it and keep/throw it away?
I guess this question goes for any monitoring device placed on your [...]

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