How Law and Order is maintained in ancient India ?

To-day, we see terrorism as a top news item in every corner of the globe. ISIS emerged as a global threat. Anti social elements have been creating havoc with society since the dawn of civilization. how ancient Indians tackled law and order situation.?  let us see. !  there are two school of thoughts  " how to tackle law and order". one is  a strict ,were punishment is to deter new  law and order situations and tackle existing turbulence. Other is, more lenient one not to punish and look for underlying causes and tackle the emotional aspect of it. ancient Indians looked at long term problems and started  sending the offenders out of society. it was possible, at that time as many areas are not occupied by people. there are enough forests and places outside villages, people, or some tribals used to live.  so those offenders of Law , were asked to leave  the civilized society and go out side kingdom.  never they were beheaded, u less their crime is barbaric and in human. Thus outcast people were not invited for social functions and there used to be no wedding and other relations with them, Though later on it became untouchable phenomenon, to start with , it was just social out caste. some times, if they show bravery and any noble act to help the village, they were taken back into society also. Thus physical punishment was reasonably less and emotional punishment was high.