Are You Checking *Here* for Case Head Separation?

Most reloaders will eventually learn about case head separation, whether incipient or actual, sometimes the hard way. Afterwards they'll hopefully inspect their cases after each firing to avoid it in the future. The Redneck Preppy says, however, that many reloaders are only looking in one place and are ignoring another, and less visible, area.

Penny wise, pound poor: Know When To Throw Away That Brass - https://www.youtube.com/watch?v=aFQsup37liM
One Tool You Need if You Reload (Particularly .303 British) - https://www.youtube.com/watch?v=NObjE0Pcwn0
Extract a Broken Case From Your Chamber...Easily! - https://www.youtube.com/watch?v=elGPwqaDf4U