sorry , you missed it completely .Usually three stages of trials...

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    sorry , you missed it completely .
    Usually three stages of trials , animal studies , limmited trials on humans largely to try and ensure safety
    and then full scale stage thrree double blind medical trials .

    Each stage must be successful to pass onto the next stage ....... you don't do expensive trials on something ALREADY proved a dud !
    In real life .....end of story .
 
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