Have you ever taken part in a double blind trial?

Question: Have you ever taken part in a double blind trial?
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  double blind
  
  trial
Asked by BigBangForever to Daniela ?, ☣ Danna, Jonny on 23 Jun 2016.
- Jonathan Hunter answered on 23 Jun 2016:
  
  Not personally, but in one of my previous jobs I helps set one up!
- Daniela Lobo answered on 24 Jun 2016:
  
  I wasn’t directly the participant to any blind trial, but I was once given samples which I had no idea what they were. I had to do experiments knowing nothing about what I was dealing with – it is harder than it sounds!

Question: Have you ever taken part in a double blind trial?