What are the major steps in preliminary and followup investigations?

Preliminary investigations typically involve securing the scene, gathering initial evidence, and collecting testimonies from witnesses to establish the facts. Investigators then assess the situation to determine the scope and direction of the inquiry. Follow-up investigations focus on analyzing collected evidence, conducting further interviews, and employing forensic techniques to build a comprehensive case. Throughout both stages, documentation and maintaining a clear chain of custody for evidence are crucial for legal processes.