law: The Motor Vehicles Act, 1988
  205. Presumption of 
  
  unfitness to drive.
  In any proceeding for an 
  
  offence punishable under section 185 if it is proved that the accused, when 
  
  requested  by a police officer at any time so to do, had refused, omitted or 
  
   failed to consent to the taking of or providing a specimen of his  breath for  
  
  a breath  test or  a specimen  of his  blood for a laboratory  test,   his  
  
  refusal,  omission  or  failure  may,  unless reasonable cause  therefor is  
  
  shown, be presumed to be a circumstance supporting any  evidence  given on  
  
  behalf  of  the  prosecution,  or rebutting any evidence given on behalf of the 
  
  defence, with respect to his condition at that time.