Final answer:
It is true that establishing 'chain of custody' is a necessity before crime scene evidence can be admitted during trial as it ensures the evidence's integrity.
Step-by-step explanation:
It is true that the "chain of custody" must be established before the prosecution can admit crime scene evidence at trial. The chain of custody is a legal term that refers to the chronological documentation or paper trail, showing the seizure, custody, control, transfer, analysis, and disposition of physical or electronic evidence.
It is essential for maintaining the integrity of the evidence and is a critical aspect of the legal process in criminal justice. Demonstrating a proper chain of custody is necessary to prove that the evidence presented at trial is the same as that originally collected and that it has not been tampered with or contaminated.