Importance of a DoJ or media representative during drug inventory

Dear PAO,

Our neighbor's son, around 19 years old, along with two of his friends, was arrested for a drug-related violation. From what I have heard, there was neither a representative from the media nor from the fiscal's office during the inventory of the confiscated drugs. Is the absence of such a representative crucial to the case? Someone who was there during the inventory, who requested to remain anonymous for now, said that the arresting officers did not even make an effort to have a representative of the media or fiscal's office attend the inventory. So, he was surprised to learn that the arresting officers stated in their report that they made such an effort when they actually did not. What can happen if the failure of the arresting officers is later proven?