Natural cotton clothing is easy to wrinkle.
When someone lies an adrenaline rush occurs, which expands the capillaries making the nose itch.
Someone who has ingested caffeine recently are (within the first tree hours) easier to manipulate.
If someone carries a backpack on one arm, they most likely sleep on the other.
If someone blinks 2 times per minute or less, it is usually nerves. Which, as many people know is linked to lying.
People usually make a lot more gestures when telling the truth, compared to when lying.

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Deduction: a guide
Non-FictionLearn to deduce people by looking at them (sorry I'm bad at descriptions)