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The preservation of evidence is a crucial aspect of the forensic investigation process, and it primarily takes place during the investigation phase. This phase encompasses the actions taken to secure and safeguard evidence to ensure its integrity and reliability for analysis and potential legal proceedings.

During the investigation phase, investigators implement strict procedures and protocols to collect, handle, and store evidence. This includes ensuring that the evidence is not altered or contaminated during collection and maintaining a clear chain of custody. These practices are essential to uphold the evidential value of the findings, which can influence the outcome of judicial processes.

The post-investigation phase generally focuses on the analysis of the evidence collected and reporting the findings. The pre-investigation phase involves planning and preparing for the investigation but does not concentrate on evidence preservation. The documentation phase records the processes and findings throughout the investigation, rather than physical evidence preservation itself. Thus, the investigation phase is specifically centered on the actions necessary to preserve evidence effectively.