I used to, a long time ago. It's not worth getting a ticket myself now, I let them get caught. I have often seen a radar trap in one direction, and a cruiser going the other way picking off those warning of the radar. While you can fight a ticket for interfering with a police officer, it just isn't worth the trouble IMO.

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2007 X3 3.0si, 6 MT, Premium, White

Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue