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					Originally Posted by  Canned Heat
					 
				 
				You know what I meant... 
			
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 I'm not sure.  I was referring to the practice of measuring when it's clearly short on the field based on the lines we're given.
(I know I'm repeating myself here....)
I trust the lines.  Always.  If we start on the 20 after a touchback and the ball is one inch short of the 30, it's short.  I *will not measure*.  I *will not* move the ball in that situation using the chains, either, because if I bring the chains out that one inch short could be a first down by the chains and that would be a problem.  
Using the lines, IMO, is the only way everyone has a consistent frame of reference.  The offense knows it needs the 30 and the defense knows it needs to hold the 30.
And since we start every new series (after a kickoff or punt) on a major yard line (actually, we don't, but we sure try to) we use the lines a lot.  I'm not going to bring the chains out when we're a foot short so the chains prove the lines are off and we actually have a first down.  The defense's coach would have a cardiac and I wouldn't blame him.