Slaves as criminal informers in ancient Rome

The Romans expected slaves to inform on their fellow slaves, particularly in regard to the master's safety. If a slave killed his master, a terrible retribution on the entire household of slaves would have to be paid to atone for the offense. In the final analysis, the slave‐informer system, with all of its drawbacks, supported the Roman criminal justice system nearly 1,000 years and the Byzantines employed it in a modified form. This paper is a case study of how a culture, with its values, musters its resources, in the case of slavery, to cope with the problems of internal security.

With most of the crime problems that confront us today, the ancient Romans were hard put to protect the public peace. They had neither the modern technology nor the forensic science that we do, so they utilized the limited resources they had to prevent crimes and catch criminals. They devised a policy of enticing slaves to act as criminal informants with the offer of freedom. Considering the sizeable adult slave population, this policy greatly deterred crime and the saying “Every slave, an enemy” became current among the citizenry.

The Romans, however, did not intend to open a door by which slaves could accuse citizens of false charges out of vindictiveness. The legal‐minded Romans adopted the safeguard of having the slave informant interrogated under torture.

Slaves also served the criminal justice system in other ways besides volunteering information. When the police were stymied in an investigation, they “rounded up the usual suspects” in the form of slaves who might have knowledge of the crime, but for some reason had not stepped forward. The police would use their powers to interrogate slaves in this case, too. This ancient practice reflects the procedure of modern police investigators checking surveillance cameras in the vicinity of the crime scene in the hopes of discovering a clue.