1. study participants have to demonstrate that they are not sensitive to placebo (toxins/allergens).
2. to be selected as 'healthy subjects", you should have no history of adverse reactions (asthma, allergies, seizures etc.)
3. you will be selected to study (and will be paid also),if you agreed to declare positive reactions to a given substance.
4. requiring informed consent biases these studies.
( Mitchell AM, Kline JA. Systematic bias introduced by the informed consent process in a diagnostic research study. Acad Emerg. Med 2008;15:225-30.)
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