Chain of Custody

The prosecution failed to show how the seized items changed hands, from when the police officers seized them from Habana to the time they were presented in court as evidence. PO1 Paras said that he turned over the sachets of shabu to the investigator on duty. But the prosecution did not adduce evidence on what the investigator on duty did with the seized articles, how these got to the laboratory technician, and how they were kept before being adduced in evidence at the trial.

Usually, the police officer who seizes the suspected substance turns it over to a supervising officer, who would then send it by courier to the police crime laboratory for testing. Since it is unavoidable that possession of the substance changes hand a number of times, it is imperative for the officer who seized the substance from the suspect to place his marking on its plastic container and seal the same, preferably with adhesive tape that cannot be removed without leaving a tear on the plastic container. At the trial, the officer can then identify the seized substance and the procedure he observed to preserve its integrity until it reaches the crime laboratory.

If the substance is not in a plastic container, the officer should put it in one and seal the same. In this way the substance would assuredly reach the laboratory in the same condition it was seized from the accused. Further, after the laboratory technician tests and verifies the nature of the substance in the container, he should put his own mark on the plastic container and seal it again with a new seal since the police officer’s seal has been broken. At the trial, the technician can then describe the sealed condition of the plastic container when it was handed to him and testify on the procedure he took afterwards to preserve its integrity.

If the sealing of the seized substance has not been made, the prosecution would have to present every police officer, messenger, laboratory technician, and storage personnel, the entire chain of custody, no matter how briefly one’s possession has been. Each of them has to testify that the substance, although unsealed, has not been tampered with or substituted while in his care. (People v. Habana, G.R. No. 188900, March 5, 2010)