The correct answer is that a suspect will always leave traces of their activity on a computer system. This is true because Locard's exchange principle in digital forensics holds that every interaction with a digital environment generates residual data, such as log entries, temporary files, metadata, or registry changes, which serve as digital traces of that contact. On the Computer Hacking Forensic Investigator CHFI exam, this principle tests your understanding that even sophisticated attackers cannot avoid leaving artifacts, making it foundational to forensic methodology. A common trap is assuming that deleting files or using anti-forensic tools erases all evidence, but the principle asserts that traces persist at some level—whether in unallocated space, memory dumps, or system logs. Remember the mnemonic: “Every contact leaves a contract with the disk,” meaning each action writes a record that a forensic examiner can recover.
CHFI Computer Forensics Fundamentals and Process Practice Question
This CHFI practice question tests your understanding of computer forensics fundamentals and process. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
According to Locard's exchange principle, which of the following is TRUE in a digital forensic context?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
A suspect will always leave traces of their activity on a computer system.
Locard's principle states that every contact leaves a trace. In digital forensics, this means that when a suspect interacts with a system, digital traces (e.g., logs, files) are left behind.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
A suspect will always leave traces of their activity on a computer system.
Why this is correct
Locard's principle implies that digital interactions leave residual data that can be recovered.
Related concept
Read the scenario before looking for a memorised answer.
✗
Only physical evidence, not digital evidence, is subject to exchange.
Why it's wrong here
Locard's principle applies to both physical and digital evidence.
✗
Digital evidence is always volatile and cannot be preserved.
Why it's wrong here
Some digital evidence is volatile, but not all; Locard's principle does not address volatility.
✗
The absence of evidence proves the suspect is innocent.
Why it's wrong here
Absence of evidence does not prove innocence; evidence may be deleted or hidden.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the CHFI exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CHFI question in full detail.
Identify which CHFI exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Computer Forensics Fundamentals and Process — This question tests Computer Forensics Fundamentals and Process — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: A suspect will always leave traces of their activity on a computer system. — Locard's principle states that every contact leaves a trace. In digital forensics, this means that when a suspect interacts with a system, digital traces (e.g., logs, files) are left behind.
What should I do if I get this CHFI question wrong?
Identify which CHFI exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. According to Locard's exchange principle, which of the following is MOST relevant to digital forensics?
easy
A.The chain of custody must be maintained for all evidence
✓ B.When a person interacts with a digital device, they leave digital traces that can be recovered
C.Every crime scene contains at least one latent fingerprint
D.Digital evidence is always stored in non-volatile memory
Why B: Locard's principle states that every contact leaves a trace. In digital forensics, this translates to the concept that digital devices leave traces of their activities and interactions, such as logs, metadata, and artifacts.
Last reviewed: Jun 21, 2026
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This CHFI practice question is part of Courseiva's free EC-Council certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the CHFI exam.
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