In a rare foray into Criminal Psychology, Jung describes here how an individual's responses to critical stimuli, particularly those related to the crime in question, can reveal underlying emotional complexes or knowledge about the crime. These responses, termed 'complex traits', include reaction times, emotional reactions and verbal responses, all of which can provide valuable clues to a person's involvement in a crime. The article acknowledges that while these results do not provide definitive proof of guilt, they do provide valuable insights for further investigation. It highlights the need for careful selection of stimulus words, the potential for both innocent and guilty individuals to show emotional responses, and the importance of psychoanalysis in interpreting the results. It also suggests that the cumulative work of many researchers may lead to more reliable diagnoses in individual cases in the future. This edition is a new translation from the original manuscript with an Afterword by the Translator, a philosophic index of Jung's terminology and a timeline of his life and works. This article is a translation from the Italian version published in 1908, because the original German (Neue aspekte der kriminalpsychologie) it was translated from has been lost. This Italian article "Le nuove vedute della psicologia criminale; contributo al metodo della "Diagnosi della conoscenza del fatto" was published in Bologna, July-August 1908) pp. 285-304. The article, translated by L. Baroncini from a German manuscript that was sent to him, but the original was not published in German, and can no longer be found. Part of this article is clearly from Jung's 1909 lecture at Clark University, so presumably, Jung sent a modified version of this lecture for publication.