I looked into the term "due diligence" and came across this small but helpful article:
https://keynorthgroup.com/insights/enhanced-due-diligence-and-fake-news-why-this-is-a-problem-and-what-to-do-about-it/
Enhanced Due Diligence and Fake News – Why this is a Problem and What to Do About it
"At the end of the day it will come down to fact-checking. Did this event occur? Does the professor who was quoted in the article exist? Were those people in that photo actually at that place at that time? Was the product in question even available in the market at the time it was alleged to have been distributed?"