Summary: 1. Introduction. 2. Due Process In Secular And Canonical Legal Systems. 3. Due Process Principles Governing Administrative Penal Procedure. 3.1. Administrative Procedural Standards. 3.2. Fundamental Substantive Due Process Rights. 4. Knowledge or Acquisition of Information or Report of a possible Delict. 4.1. The notitia criminis. 4.2. Procedural Due Process in addressing a notitia criminis. 4.3. Standards of Due Process in handling a notitia criminis. 5. The preliminary investigation phase. 5.1. Procedural Due Process in the preliminary investigation. 5.2. Standards of Due Process in the conduct of Preliminary Investigation. 6. The administrative penal procedure. 6.1. Procedural Due Process in the conduct of administrative penal procedure. 6.2. Standards of Due Process in the conduct of the administrative penal procedure. 7. Conclusions. Bibliography. Thesis Index.