True, everything is far from the same as in film detectives. If "capable" - just not the fact that it turns out to be a murderer. Rather, on the contrary: the killer will be the one who does not make such an impression in a normal state - for everyday murders are just committed, most often, in a state of passion.
And "cold-blooded killers", in addition to the ability to calculate a crime, also have the ability not to get caught - at least with blood on their hands.Toxic Person Test
A person has no instincts (one is, and this is not the one you think about), there are only reflexes. And the perception of danger is really connected with them. However, a reflex is already a consequence of perception, and perception (specifically, danger) is built on the memory of personal.