Crime scene investigators use various collection methods to gather crucial...
Combined Science207 views·Updated May 27, 2026·3 pagesForensic Science Methods for Evidence Collection
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emilie@em1l1e
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Collection Tools and Basic Techniques
Crime scene investigation relies on specialised tools like tape, tweezers, powders, and adhesive stubs for collecting gunshot residue. These tools help preserve evidence integrity whilst maintaining the chain of custody.
Shaking is the simplest collection method - you literally shake items over paper or containers to dislodge loose evidence. Whilst it's quick and easy, this technique doesn't document where evidence was originally located, and some particles might stubbornly stay attached.
Brushing involves using clean brushes or combs to collect evidence from victims or suspects, with paper placed underneath to catch falling particles. Each area requires a fresh brush to prevent cross-contamination, and everything gets packaged separately.
Key Point: Both shaking and brushing work brilliantly for collecting fibres, hairs, glass fragments, and paint chips - evidence that could link suspects to crime scenes.
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Advanced Collection Methods
Taping uses one-sided adhesive tape pressed against surfaces like car seats until the stickiness disappears. The tape then gets mounted on clear acetate sheets for protection and analysis - perfect for collecting fingerprints and fibres.
Casting transforms 2D impressions into permanent evidence using plaster of Paris mixed with water. Fine powders help develop footprints on flat surfaces, whilst chemicals enhance impressions on glass or tiles.
Vacuuming involves specialised equipment with filtered traps that catch microscopic evidence from suspected areas. Everything collected gets packaged in clean trace paper before heading to the laboratory for analysis.
Quick Tip: Casting works exceptionally well for footwear impressions, tyre prints, and tool marks - evidence that can directly link suspects to specific locations.
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Precise Collection Techniques
Hand picking requires careful visual examination of objects, sometimes using magnifying glasses to spot tiny evidence like hairs, fibres, glass, soil, or paint. When you find something, it goes straight into appropriately sized packaging to prevent loss.
Swabbing demands precision - you apply the swab tip to sample areas, rotating once whilst applying moderate pressure. The entire swab surface must contact the object, but over-rotating can damage delicate evidence.
This technique excels at collecting touch DNA, fingerprints, cells, blood, and other bodily fluids that might be invisible to the naked eye. Proper swabbing can recover DNA from surfaces that suspects barely touched.
Remember: Each collection method serves specific evidence types - choosing the right technique can make or break a criminal investigation.
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Combined Science207 views·Updated May 27, 2026·3 pagesForensic Science Methods for Evidence Collection
E
emilie@em1l1e
Crime scene investigators use various collection methods to gather crucial evidence that could solve cases. These techniques range from simple shaking methods to more complex casting procedures, each designed to preserve different types of evidence without contamination.
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of 3
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Collection Tools and Basic Techniques
Crime scene investigation relies on specialised tools like tape, tweezers, powders, and adhesive stubs for collecting gunshot residue. These tools help preserve evidence integrity whilst maintaining the chain of custody.
Shaking is the simplest collection method - you literally shake items over paper or containers to dislodge loose evidence. Whilst it's quick and easy, this technique doesn't document where evidence was originally located, and some particles might stubbornly stay attached.
Brushing involves using clean brushes or combs to collect evidence from victims or suspects, with paper placed underneath to catch falling particles. Each area requires a fresh brush to prevent cross-contamination, and everything gets packaged separately.
Key Point: Both shaking and brushing work brilliantly for collecting fibres, hairs, glass fragments, and paint chips - evidence that could link suspects to crime scenes.
2
of 3Sign up to see the content. It's free!
- Access to all documents
- Improve your grades
- Join milions of students
Advanced Collection Methods
Taping uses one-sided adhesive tape pressed against surfaces like car seats until the stickiness disappears. The tape then gets mounted on clear acetate sheets for protection and analysis - perfect for collecting fingerprints and fibres.
Casting transforms 2D impressions into permanent evidence using plaster of Paris mixed with water. Fine powders help develop footprints on flat surfaces, whilst chemicals enhance impressions on glass or tiles.
Vacuuming involves specialised equipment with filtered traps that catch microscopic evidence from suspected areas. Everything collected gets packaged in clean trace paper before heading to the laboratory for analysis.
Quick Tip: Casting works exceptionally well for footwear impressions, tyre prints, and tool marks - evidence that can directly link suspects to specific locations.
3
of 3Sign up to see the content. It's free!
- Access to all documents
- Improve your grades
- Join milions of students
Precise Collection Techniques
Hand picking requires careful visual examination of objects, sometimes using magnifying glasses to spot tiny evidence like hairs, fibres, glass, soil, or paint. When you find something, it goes straight into appropriately sized packaging to prevent loss.
Swabbing demands precision - you apply the swab tip to sample areas, rotating once whilst applying moderate pressure. The entire swab surface must contact the object, but over-rotating can damage delicate evidence.
This technique excels at collecting touch DNA, fingerprints, cells, blood, and other bodily fluids that might be invisible to the naked eye. Proper swabbing can recover DNA from surfaces that suspects barely touched.
Remember: Each collection method serves specific evidence types - choosing the right technique can make or break a criminal investigation.
We thought you’d never ask...
What is the Knowunity AI companion?
Our AI Companion is a student-focused AI tool that offers more than just answers. Built on millions of Knowunity resources, it provides relevant information, personalised study plans, quizzes, and content directly in the chat, adapting to your individual learning journey.
Where can I download the Knowunity app?
You can download the app from Google Play Store and Apple App Store.
Is Knowunity really free of charge?
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
Most popular content in Biology
9Most popular content
9Can't find what you're looking for? Explore other subjects.
Students love us — and so will you.
4.6/5App Store
4.7/5Google Play
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan SiOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha KlichAndroid user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
AnnaiOS user