How do women know when men are hidding things

Their tone of voice and body langauge. Women are pretty good at reading people.

They don't. They just accuse them of random shit and it turns out to be true

Instinct usually and then we become better than FBI hunting for truth.

If they already know their "normal" behavior then we can tell something's brewing when their tone changes.... subtle, but it's sensed

It's easy. They don't cover all their tracks.

That's a secret