According to forensics video expert Grant Fredericks, the police should have asked for the physical hard drives of the gym surveillance video cameras to make sure they acquired complete, unedited video. Such a step is widely regarded as necessary to make sure video footage is .

Such a step is widely regarded as necessary to make sure video footage is authentic.

Explanation:

Surveillance video camera plays a main role during investigation. Whenever the police department handles a criminal case, they depend on the surveillance video camera to get any clue regarding the crime.

The surveillance cameras in the crime committed areas are thoroughly checked to get the supporting proof.

It is mandatory to get the physical hard drives of the surveillance video cameras to make sure that they have acquired the unedited video. Thus the police can ensure that the evidence provided is authentic.