CHFI Computer Forensics Fundamentals and Process Practice Question
Which of the following principles states that when two objects come into contact, there is a transfer of material between them?
⚠ Common exam trap
The CHFI exam often tests the distinction between legal rules (best evidence, hearsay, chain of custody) and forensic principles (Locard's exchange), so candidates mistakenly choose a legal term that sounds related to evidence handling rather than the actual transfer concept.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Locard's exchange principle
Locard's exchange principle is a foundational concept in forensic science stating that whenever two objects come into contact, there is a transfer of material between them. In digital forensics, this principle applies to the transfer of digital artifacts (e.g., file fragments, metadata, network traces) when systems interact, such as when a suspect's device connects to a server or when data is copied between storage media.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
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The best evidence rule
Why it's wrong here
The best evidence rule, codified in Federal Rule of Evidence 1002, requires the original writing, recording, or photograph to prove its content; with digital evidence, a forensically sound bit-stream copy is admissible as a 'duplicate' under Rule 1003 unless authenticity is genuinely challenged. It is an evidentiary authenticity requirement, so it cannot be the forensic principle describing the transfer of materials when objects come into contact.
- ✓
Locard's exchange principle
Why this is correct
Locard's exchange principle states that whenever two objects come into contact, there is a cross-transfer of trace material; in forensic computing, this translates to the persistence of artifacts such as filesystem metadata, unallocated slack space, and cache/log entries even after user attempts at deletion. This principle forms the foundation of digital trace recovery, guiding examiners to preserve volatile memory and hard drive remains because every interaction necessarily leaves some discoverable residue.
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The chain of custody
Why it's wrong here
Chain of custody is a procedural control mechanism, not a scientific principle, that documents the location, possession, and integrity of evidence at every step from collection through courtroom presentation. When a forensic examiner signs for a drive and records time, date, and cryptographic hash values, they are creating a chain of custody to demonstrate that no unauthorized access or contamination occurred. This process safeguards evidence but does not explain the physical or digital trace exchange that occurs at a contact event.
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The hearsay rule
Why it's wrong here
The hearsay rule prohibits using out-of-court statements offered to prove the matter asserted, and in digital forensics it can affect whether log files, chat transcripts, or automatically generated reports are admitted unless a recognized exception applies. This rule deals with testimonial reliability and courtroom admissibility, not with the physical reality that objects in contact exchange material. Therefore it is not the principle that describes the creation of transfer traces between two objects.
Go deeper
Related to this question
Learn chapter
Mobile Device Forensics: iOS and Android
Key term
Forensic Evidence Collection
Forensic evidence collection is the process of identifying, preserving, and gathering digital data from computers and devices in a way that keeps it valid for use in legal investigations or internal incident response.
Key term
Memory Acquisition
Memory acquisition is the process of capturing the contents of a computer's volatile memory to preserve data for forensic analysis and incident response.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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