UNKNOWN
There were means of finding out why A was a witch.  A, a person becomes sick, we consult a traditional healer.  He has got his own bones, he throws them and says no the cause here is not a witch.  We will now perform certain ritual things wanted by our own ancestors.  Go and perform those rites, or B, a certain neighbour a certain aunt is jealous of this.  Anyhow, she or he will say "don't worry, I will treat this".  Then if the child is not treated and then should that child die, seeing the first doctor has already told us that aunt A was responsible for that illness, we will go and kill that aunt in the old system.  The system worked very, very well.  You go to the royal kraal.  I am accusing A, he's a witch, he has killed my own daughter and the chief says "right, you bring two heads of cattle at the royal village.  I am going to give you a messenger.  You go to a more powerful diviner, unknown to yourself and unknown to us.  That particular person who knows nothing about this case, will tell us who the witch is."  Then they go to that Sangoma.  The Sangoma might clear this first accused, and to show that he has cleared you he gives you a small horn.  You keep on blowing that horn right at the royal village to say I'm cleared, I'm clean.  That day they will know that somebody who was cleared is coming back home in style.