Originally posted by Stewart P Evans
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When a murder is committed, the evidence is sometimes cloudy, but the police have to start somewhere. This is where personal opinion comes in. Going on gut feeling the police target a likely suspect.
They then must interpret the maze of trace evidence, crime scene photos, known whereabouts of people involved, and any alibis given. If the evidence does not point to their gut feeling suspect, they must then move on.
Without supposition there would be no profiling. Getting inside the head of the perp requires visualizing and fitting together facts to approximate the killer's identity. This is nothing if it is not supposition. It is a guide line not a blueprint. It gives a general pattern to work from, not a blueprint which will produce one and only one criminal.
Speculation is a must for crime investigation. Ex. There was a body found in Miller's Court destroyed beyond identifying by the forensics of the day. It would have been insane of any investigator if they did not speculate that the body was Mary Kelly. Her room, her bed, some of her clothes in the room, hair color approximately correct. The fact that witnesses reported seeing Mary alive after that body was dead would then cause speculation that it wasn't Mary after all. This would lead to the discovery that she allowed other women to share her room.
This doesn't rule out Mary as the body, the facts would make one believe it was she. The eyewitness statements if taken as not mistaken as to time or person produce facts that allow the ID to be questioned.
Every fact may be passed through personal opinion, but personal opinion must not twist facts. Interpretation of evidence must be careful to not stray into fantasy. Blood spatter for example, follows certain patterns. It is when the patterns are either ignored or misinterpreted that they become useless. When personal opinion and interpretation ignore facts that do not conform, personal opinion and interpretation need to change.
Supposition may be given as long as facts are not ignored. It is building fact to fact, filling in missing data with the most logical pathway. Just don't draw a circle from point a to point b. A straight line is the answer. Speculation is a conclusion drawn from fact. If it doesn't match fact, speculation goes out the window. A profile that ignores fact will find only wrong suspects.
So every conclusion comes from the things you mention. If the four miss the facts, then they are wrong. If they fit, they can send the guilty to justice.
God Bless
Darkendale
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