A forensic investigator is analyzing a recent breach case. An external USB drive was discovered to be connected and transmitting the data outside of the organization, and the owner of the USB drive…

Best evidence refers to the most original or primary form of evidence, such as the actual physical USB drive or the original system logs, and describes the quality of evidence, not its type in terms of directness to the fact.

Indirect evidence, also known as circumstantial evidence, does not directly prove a fact but instead requires an inference or logical deduction to connect it to the conclusion. In this scenario, the video surveillance shows multiple people had 'close contact' but does not directly identify the specific individual who plugged in the malicious USB drive and exfiltrated data, thus requiring an inference to establish culpability.

Direct evidence directly proves a fact without the need for inference; for example, if the video clearly showed a specific person inserting the identified malicious USB drive and initiating data transfer.

Corroborative evidence strengthens or supports other existing evidence, but it is a function of evidence rather than a primary categorization of whether it directly proves a fact or requires inference.