Are you given documentation telling you you're vaccinated, or do you receive no indication as to if you received the vaccine or placebo? - It's either one or the other; it can't be both.
You are given documentation. You may or may not be vaccinated. Otherwise you would be able to know which group you're in. If you know that you didn't get the vaccine, you may act more cautiously, skewing the results. It's important that all participants recieve the exact same information, placebo or not.
So when you said -
>You're given documentation showing you're vaccined when you're in a covid vaccine trial.
You lied.
Pause for a second and think.
Statement A: You receive documentation about your vaccination status. The status? Vaccinated.
Statement B: You may or may not be vaccined, since you might have recieved a placebo treatment.
Does statement A contradict statement B? Clearly not. Both can be true at the same time.
Statement A: You receive documentation about your vaccination status. The status? Vaccinated.
You are 100% guaranteed to be vaccinated and you know full well that you are vaccinated. Because you received documentation stating that you are in fact vaccinated.
Statement B: You may or may not be vaccined, since you might have recieved a placebo treatment.
You are 100% guaranteed to not be vaccinated and you know full well that you are not vaccinated. Because (according to your logic) people in the trials who are vaccinated receive documentation stating they are vaccinated. And by NOT receiving documentation stating you're vaccinated, that proves you received a placebo.
According to you -
Person A in the trials receives documentation stating they are in fact vaccinated.
Person B in the trials does not receive documentation stating they are vaccinated.
Therefore, Person A knows they're vaccinated because they received documentation stating so. While Person B knows they are not vaccinated because if they were vaccinated they would have received documentation stating so, but because they didn't, they know they received the placebo.
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