“Flaws Abound in Background Checks,” The Wall Street Journal, June 12, 2018 A3. {Article not available on-line). The NCIS background check (prior to gun purchases) isn’t 100% effective, because not everyone reports.
Where does your information come from? Is it complete, accurate, and up-to-date? Does some of it come (or not come) from third parties?
How much do you rely on it in making important decisions?