History of the private detective

Private Investigator Training

Becoming a private investigator was becoming such a popular field, that by 1915 the C.T. Ludwig Detective Training Correspondence School opened its doors. For $7.50, a junior detective could receive 10 lessons in private investigation. Furthermore, students of the school received a ruler and a 265-page book entitled “Laws the Detective Should Know.” Those who completed the course received a gold and enameled Official Badge of Membership of the school.

In 1943, Arthur H. Farrar published “Criminal Code and G-Man Mastery Booklet.” This 61-page book contained instructional stories, useful information, and case descriptions. Many more books in the field of private investigation soon followed.

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