score:2
Either never or in hunter gatherer days, depending on the meaning of your question.
The oldest recorded civilization is the Sumerians, which historians apparently claim practiced "fair trials".
http://www.angelfire.com/empire2/unkemptgoose/Sumerian.html
Preserved clay tablets reveal that the Sumerians maintained courts of justice where people could expect a fair trial. One table recorded the oldest murder trial in history.Most of the food production and distribution was controlled through the temple. A noble class arose based on land ownership, control of trade, and manufacturing. Most trade and manufacturing was outside the templeβs control.