Dynamic charge of proof is a theory of probative law that assigns the charge of proof to the part proceedings with more access to do. This was used by the State Council to resolves cases of administrative responsibility by the medical activity, between 1990 and 2006 years, because it was difficult for the medical patient proof the facts constitutes of the state failure in medical service. In its first stage, the dynamic charge of proof was used, but with the permanent presumption of service failure. Later, the concepts were unified to determine that dynamic charge of proof should be applied following their guidelines. However, in the 2006 year, that was left for returned to the failure proven in which the petitioner must prove all facts of the claim, in this the circumstantial evidence is very important. In this text, we are going to show the reasons that cause the change.