The UPLR and FPLA (you have to count the FTC rules) state which units are 
legal, "these and no others."  You just don't like the answer because it 
requires dual, and has to be changed to require anything else.


--- On Sun, 3/15/09, Jeremiah MacGregor <[email protected]> 
wrote:

> From: Jeremiah MacGregor <[email protected]>
> Subject: [USMA:43926] Re: US Standard
> To: "U.S. Metric Association" <[email protected]>
> Date: Sunday, March 15, 2009, 6:23 PM
> If that were so, then why are there problems with the
> FPLA?  If the standard is set then any law that does not
> permit metric only to stand on its own would be invalid and
> legal to ignore. 
> 
> We need a law with wording that SI is not the preferred
> standard but the only legal standard.  Then laws allowing
> states to revert to English units in road construction
> would become illegal.  
> 
> Setting the standard would mean the US law would
> incorporate a Weights and Measures Act specifically
> declaring what units are legal and illegal for use in trade
> and commerce.  
> 
> Jerry 
> 
> 
> 
> 
> ________________________________
> From: "[email protected]"
> <[email protected]>
> To: U.S. Metric Association <[email protected]>
> Sent: Sunday, March 15, 2009 1:40:41 PM
> Subject: [USMA:43910] US Standard
> 
> 
> Jerry,
> 
> Congress has set the Standard, recently as Public Law
> 100-418
> declaring the metric system as preferred for US trade and
> commerce, and previously by various other Acts.
> 
> Read page iii of NIST SP 811.
> 
> Gene.

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