I once was pulled over for doing 25mph over the limit, and when the cop asked, my response was "I do know, but if I say then it will be an admission of guilt" (stupid answer on my part). The cop then went on to give me a verbal lecture that included a couple of words from the naughty list, and he went to his car and came back with an official warning on paper. I felt lucky considering my idiot response 
		 
		
	 
 
Oftentimes, the question is asked because there are people who really have no idea they were speeding due to being distracted by other things.  Its a rhetorical question regardless. The cop knows what your speed was, so it really doesn't matter in terms of trying to hide how fast you were really doing.  Oftentimes, one may not know the actual speed they were doing, but knew they were speeding.  And in these situations, that kind of honesty has been known to generate nothing more than a verbal or written warning, even from (shockingly) a motorcycle cop (shocking, because their sole reason for being is traffic enforcement).  Though its no guarantee of course, as it depends on the officer.  And it likely won't work in cases of criminal speeding.
 
I remember once an SUV that had a piece of luggage fall off the top of it on the freeway.  The bag already got clipped by one car and was in the right lane.  We stopped, picked up the luggage, and then hightailed it to pull over the SUV simply so we could return the luggage to the driver and remind them to check their tiedowns on their luggage rack.  Made the traffic stop, and it's a guy and his family.  Getting to the drivers window, we weren't even able to say "hello!" before we get the "officer I wasn't going faster than ANY of the other vehicles on the freeway were, and EVERYONE is speeding here! I don't know why you are singling ME out.  Is it because Im driving a Lincoln? I swear there are people going faster than me....yada, yada, yada, blah, blah, blah"  We let the guy go on for about 3 or 4 minutes just for our own sheer amusement, and because we couldn't get a word in edgewise anyway, before we were 
finally able to say "sir, is this your bag?"  To which we get "....why are you taking bags off of my truck???? blah, blah, blah, (another 1 minute tirade)" until we were able to explain to him that it fell off of his roof rack, and we were returning it to him.  What do we get? "....look at this, it's damaged now! Why didn't you prevent it from getting hit?? (yeah, thats what happens when luggage bounces down the roadway....maybe YOU should take some responsibility for securing your won stuff).  Then and only then did he shut the hell up and actually calm down, to the embarassed look on his wife and kids.  No thanks, no nothing.  If I had been a DPS officer, I would've written him up for 28-898 of the AZ vehicle code, in part due to his crappy attitude.
 
So for people who think that cops are the only problem and are bad people; try dealing with the whole of society someday.  It's an eye opener. 
