CSI Study Guide 2026

Everything you need to pass the CSI exam in one place: the exam format, every topic to study, real practice questions with explanations, flashcards, and full-length practice tests. Free, no sign-up needed.

📋 CSI Exam Format at a Glance

100

Questions

180 min

Time Limit

75%

Passing Score

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📚 CSI Topics to Study (61)

Biological and Trace Evidence · 7 cards Biological and Trace Evidence · 7 cards Biological and Trace Evidence · 7 cards Biological and Trace Evidence · 7 cards Courtroom Testimony and Ethics · 7 cards Courtroom Testimony and Ethics · 7 cards Courtroom Testimony and Ethics · 7 cards Courtroom Testimony and Ethics · 7 cards Crime Scene Documentation and Reporting · 7 cards Crime Scene Documentation and Reporting · 7 cards Crime Scene Documentation and Reporting · 7 cards Crime Scene Documentation and Reporting · 7 cards Crime Scene Reconstruction · 7 cards Crime Scene Reconstruction · 7 cards Crime Scene Reconstruction · 7 cards Documentation Techniques · 7 cards Documentation Techniques · 7 cards Documentation Techniques · 7 cards Documentation Techniques · 7 cards Forensic Analysis Techniques · 7 cards Forensic Analysis Techniques · 7 cards Forensic Analysis Techniques · 7 cards Forensic Analysis Techniques · 7 cards Forensic Death Investigation · 7 cards Forensic Death Investigation · 7 cards Forensic Death Investigation · 7 cards Forensic Death Investigation · 7 cards Impression and Pattern Evidence · 7 cards Impression and Pattern Evidence · 7 cards Impression and Pattern Evidence · 7 cards

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✍️ Sample CSI Questions & Answers

1. When photographing a footwear impression in mud, which sequence is correct?

✓ Without scale first, then with scale, using oblique lighting for both

Best practice is to photograph first without a scale (to show the impression undisturbed), then with a scale, and use oblique lighting to reveal detail in both shots.

2. Under what circumstance may a CSI legally enter and process a crime scene without a search warrant?

✓ When exigent circumstances exist, such as an ongoing threat to life

Exigent circumstances, such as a risk to life or imminent destruction of evidence, are recognized exceptions to the warrant requirement under the Fourth Amendment.

3. What is a 'rough sketch' in crime scene documentation?

✓ A preliminary, not-to-scale drawing made at the scene for reference

A rough sketch is a preliminary, not-to-scale drawing created at the scene that will later be refined into a finished sketch.

4. What is the purpose of DNA analysis in forensic investigations?

✓ To identify individuals through genetic material

DNA analysis is a powerful forensic tool used to create a unique genetic profile from biological samples like blood, saliva, hair, or skin cells. This profile can then be compared to known individuals or databases to identify suspects, victims, or establish connections between individuals and a crime scene. It provides highly reliable identification for investigations.

5. Why is it important to take photographs of the crime scene before collecting evidence?

✓ To document evidence location and crime scene condition

Photographs provide a permanent visual record of the crime scene's original state before any evidence is moved or collected. They document the precise location of evidence, the overall layout, and the condition of the scene, which is crucial for reconstruction and later analysis. This initial documentation is vital for maintaining the context and integrity of the evidence.

6. Why is a crime scene sketch important?

✓ To show spatial relationships of evidence

A crime scene sketch is crucial because it provides a scaled diagram illustrating the precise location of evidence relative to fixed points and other items within the scene. This visual representation helps investigators and jurors understand the layout and context of the evidence, which photographs alone cannot always convey accurately. It clarifies spatial relationships essential for reconstructing events.

🎯 Free CSI Practice Tests

Management Principles · 7 questions Forensic Death Investigation · 7 questions Crime Scene Reconstruction · 7 questions Crime Scene Reconstruction · 7 questions Crime Scene Reconstruction · 7 questions Forensic Death Investigation · 7 questions Management Principles · 7 questions Management Principles · 7 questions Management Principles · 7 questions Forensic Death Investigation · 7 questions

📖 CSI Guides & Articles

Your CSI Study Path

1. Learn with Flashcards → 2. Drill Practice Tests → 3. Take the Full Exam Simulation

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