The deterrent effect of the death penalty is a matter of controversy. Researchers led by Dieter Hermann from the Institute of Criminology at the University of Heidelberg have now undergone 82 investigations into the death penalty of a meta-analysis. Result: The individual studies strongly depend on the scientific context of the respective author. Scientists with an economic background generally confirm the deterrent effect. The opposite is true for sociologists, criminologists and legal scholars. Hermann therefore concludes: "Since we do not know which of the opposite results are more reliable, the death penalty lacks the general preventive justification." In other words, the deterrent effect of the death penalty is by no means scientifically proven.