I think you are missing the point of a placebo. They mainly used to test again the "real" drug. If the results are the same for both the real and placebo drug, the real drug is useless. Just because you give somebody a placebo and tell them it is something else doesn't mean it is going to work.
Then again, when I was in high school, a buddy brought my girlfriend and me a couple of soda's a a school dance and after I took the first drink it dawned on me that he might have drugged them (even though he hand not) but I did not feel right for about 5 minutes while I "thought" I was going on a trip or something.
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