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Finger print identification
To find fingerprints they would dust the crime scene for any prints and if they found one they would compare it to the suspect. -
Psychology
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. -
Handwriting comparison
In 1933 they compared the handwriting of "bertha" to the hand writing of suspect Sarah Hobart. Later found guilty. -
Typewrittwer comparrison
In typed letters or notes they would compare the typed information to a typewriter that the suspect used or may have used.