Everybody is an Investigator
Everyday people interact with others that could have different intentions.
People lie, hide things or volunteer information for their own agenda.
Security Investigation enables one to easily spot issues of concern!
By fostering and empowering human-instinct to uncover in their story the loopholes, damning issues besides opportunities (ways to benefit or methods to mitigate the threat) will save you disappointment besides time, effort, and money.