There are criticisms and controversy surrounding the decision to implement Gacaca courts. Human rights groups worry about the fairness since trials are held without lawyers which means that there is less protection for defendants than in conventional courts. In addition conventional trials have seen false accusations and intimidation of witnesses on both sides; issues of revenge have been raised as a concern. The acquittal rate has been 20 percent which suggests a large number of trials were not well-founded. Also because the trials are based on witnesses' testimonies, the length of time between the crime and trial heightens the risk that the witnesses' memories will be unreliable.