Why is network isolation important during evidence collection?

Network isolation is crucial during evidence collection primarily to prevent data alteration. When collecting digital evidence, it's essential to maintain the integrity of that data. If a device remains connected to a network, it may receive updates or changes from remote servers, or it could be accessed by unauthorized users, leading to potential modification or deletion of critical data. By isolating the device from any network connection, investigators can preserve the original state of the evidence, ensuring that what is collected is exactly as it was at the time of seizure.

The other options, while they touch on aspects of the evidence collection process, do not specifically address the vital concern of data integrity in the context of network interactions. For instance, facilitating faster retrieval, ensuring device power supply, and streamlining documentation are all important in the context of evidence handling but they do not directly address the primary risk of data alteration that network connectivity poses.