Fetiches are set up to punish offenders in certain cases where there is an intention to make a law specially binding; this refers more particularly to crimes which cannot always be detected. A fetich is inaugurated, for example, to detect and punish certain kinds of theft; persons who are cognizant to such crimes, and who do not give information, are also liable to be punished by the fetich. The fetich is supposed to be able not only to detect all such transgressions, but has power, likewise, to punish the transgressor. How it exercises this knowledge, or by what means it brings sickness and death upon the offender, cannot, of course, be explained; but, as it is believed in, it is the most effectual restraint that can possibly be imposed upon evil-disposed persons.