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To find fingerprints they would dust the crime scene for any prints and if they found one they would compare it to the suspect.
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They would take there tough cases to a psychologist and have them look over the information and give them information on the suspect like gender, age, race ect.
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In 1933 they compared the handwriting of "bertha" to the hand writing of suspect Sarah Hobart. Later found guilty.
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In typed letters or notes they would compare the typed information to a typewriter that the suspect used or may have used.
