People have already answered stating anonymous surveys, but since I have experience conducting surveys with sensitive information, I’d like to add just a little extra info:
I used to do research in college for a psychologist who was looking at the effect of different drugs (both legal and illegal) on personality, and vice versa.
There is actually a pretty strenuous burden placed on the researcher to protect participants privacy and answers. There is also a certification process that makes the personal info impossible to be compelled to give out to any governmental agency (if, for example, someone participated, admitted drug use, and then was arrested. The police cannot force you to inform them that the participant admitted drug use). There are a number of other processes that we had to go through in data collection and storage to ensure the privacy of participants was retained.
The only exception to this being if the participant admitted the desire to harm self or others to us, in which case we were instructed to contact authorities and provide them with the name and that the participant might commit self harm or harm others
TL;DR: There’s a ton of regulation to protect sensitive info, and no one, not even the federal government, can compel you to give out info (provided you get the correct certification)
EDIT: The authorities were only contacted in cases where the participant admitted desire to harm others. If a person admitted self harm, or thoughts of self harm, they were recommended to seek a mental health professional and given a list of mental health professionals in their area. Sorry for the confusion!
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