To hear the phrase, "They can smell fear" repeatedly which implies human can smell fear is a myth.
Wolves, dogs, lions and cats can smell fear which is true.
Humans can see fear in body language, tone of voice, the way a person breathes and in the way eyes move.
Humans can sense fear with the gazing of the eyes because the eyes reveal everything.
Humans acting confident and actually being confident are two totally different things.
Humans are inclined to benefit of the doubt, nervousness, socially awkwardness, believing in humanity too much and believing in humanity too little.
The Scent of Desperation is the trembling of the hands, the waver in the voice, the heavy breathing and the wobbly walk.