I know it exists and it has a name...
But my google-fu skills are lacking, due to a pretty niche concept that uses a lot of generic keywords.
There is a fallacy / mental model / a tendency for people to portray themselves in a positive light.
I know about "80% of drivers thinking they are better than average" https://en.wikipedia.org/wiki/Dunning%E2%80%93Kruger_effect and https://en.wikipedia.org/wiki/Illusory_superiority but it is not exactly what I'm looking for.
Have you ever taken / ingested / consumed cannabis?
Answer "YES" to this question would admit doing something illegal, with potentially negative consquences, including the fact that the researcher might be an undercover cop. Therefore, even if the genuine answer is "YES", there is a non-zero probability that the recorded answer is "NO"
To account for this tendency
INSERT NAME HERE _____________ I would like to suggest an alternative design of the same question that involves a 2nd researcher
"We are aware of the tendency
INSERT NAME HERE _____________
"We are working towards legalization efforts..."
"This will be treated in the strictest confidence..."
"We know that asking "YES / NO" questions about drug use can make people..."
"Our goal is to obtain more accurate estimate..."
"anonymity bias" - loads of interesting research papers, including one specifically about cannabis (link):
Of course the sample size is small but the discrepancy is clearly visible (other research papers confirm it too).
I am aware that anonymity might not be enough to obtain accurate results, that's why the design of the study with the 2nd researcher but I just want to sound a little bit smarter and read more about
INSERT NAME HERE _____________ - surely it has a name?
EDIT: if it does not have a name, I'll take the "Robertson Syndrome"