Phenomenon by providing a Doctor's certificate in the criminal justice system involving a witness, a suspect, accused in corruption cases start of the examination in the Police, the Prosecutor's office, Corruption Eradication Commission, the Court, as well as in Correctional Institutions, stating that the person concerned should be treated and treated specifically and also nothing should be referred to the hospital with complete amenities, this phenomenon has been carried out since long. The utilization of a doctor's certificate is against the law in criminal cases of corruption, according to the dynamics of law enforcement in Indonesia is certainly not going to stop. If this issue continues to be adversely affects the process of law enforcement in Indonesia. The research method used in this research is normative juridical. The source of the data obtained in this research is sourced from the material library and descriptive analytics which is intended to reveal a problem or situation or event as it is so that it can uncover the actual facts. The results in this study show that Fraud and irregularities a Doctor's certificate will easily occur. There is a strong tendency among law enforcement, that a doctor's certificate is evidence that the strong, and can not be contested. In the history of law enforcement corruption in Indonesia, law enforcement has yet to cultivate the examination and make a doctor's certificate is genuine or fake and can be justified scientifically and professionally. In addition, it is also never ask for another opinion from another doctor to check the health of a person declared sick and was unable to be present in the judicial process, from the previous doctor. Keywords: A Doctor's Certificate, Criminal Justice, Corruption.