The Department shall uphold the Rule of Law and ensure the effective and efficient administration of justice.

To accomplish its mandate, the Department shall:

• Act as the principal law agency of the government and as legal counsel and representative thereof, whenever so required;
  
  
• Investigate the commission of crimes, prosecute offenders and administer the probation and correction systems;
  
  
• Extend free legal assistance/representation to indigents and poor litigants in criminal cases and non-commercial civil disputes, and other litigations;
  
  
• Preserve the integrity of land titles through proper registration;
  
  
• Investigate and arbitrate untitled land disputes involving small landowners and members of indigenous cultural communities;
  
  
• Provide immigration and naturalization regulatory services and implement laws governing citizenship and the admission and stay of aliens;
  
  
• Provide legal services to the national government and its functionaries and their subsidiaries.