This chapter discusses legal issues pertaining to a fire investigator's right to access and remain at a fire scene. It describes Supreme Court cases like Michigan v. Tyler and Michigan v. Clifford that established investigators can search for the origin and cause without a warrant but need an administrative warrant to return later. Consent from the property owner is also sufficient but can be rescinded, requiring a warrant. The chapter outlines the difference between legislative laws, case laws, and exigent circumstances that allow warrantless entry during an emergency. It stresses the importance for investigators to understand applicable laws and seek legal counsel.