My suggested rules of common sense:
1. If something makes perfect sense, it is perfect truth.
2. If something makes sense to you, it is almost always true.
3. If something does not make sense to you, it is usually a lie but is at least less than the whole story. Search for the missing parts of the story to learn whether it is truth or a lie.
4. If something strikes you as nonsense, it is nonsense. It is a lie.
I used these rules as a trial lawyer. I focused on exploring the statements that did not make sense. That is where I focused discovery and examination of witnesses in an effort to find the whole story to determine if it was true or false.
Never check your common sense at the door.