Save
Busy. Please wait.
Log in with Clever
or
show password
Forgot Password?
Don't have an account?  Sign up 
Sign up using Clever
or
Username is available taken
show password


Make sure to remember your password. If you forget it there is no way for StudyStack to send you a reset link. You would need to create a new account. Your email address is only used to allow you to reset your password. See our Privacy Policy and Terms of Service.

Already a StudyStack user? Log In

Reset Password
Enter the associated with your account, and we'll email you a link to reset your password.
focusNode
Didn't know it?
click below
 
Knew it?
click below
Don't Know
Remaining cards (0)
Know
0:00
edit
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

  Normal Size     Small Size show me how

Trace Evidence

Forensics section about hair and fibers.

QuestionAnswer
What is trace evidence? Any very small, physical material that can be transferred from person to person or between person and a crime scene.
What are examples of trace evidence? Hair, fibers, pieces of glass, paint chips, dirt, and plant material
What are the 3 major parts of hair? Describe them. The parts of hair are the cortex, cuticle, and medulla. The cortex is the largest part that gives hair color. The cuticle is the layer of cells that cover the surface. The medulla are the cells that run down the center of the cortex.
What are the 3 types of cuticles? They are coronal, spinous, and imbricate.
What is the medullary index of humans compared to other animals? Humans have an index of 0.3 while other animals have indexes greater that 0.5.
Trichology is what? The study of hair.
What type of hair is best for analysis? Scalp hair.
What are the classifications of fiber? They are mineral, animal, vegetable, and synthetic.
What are the fiber identification tests? They are the burn test, solvent/solubility test, the stain test, and the microscopic tests.
What are the collection methods for fibers and hair? They are the tape method and the sweeping/vacuuming methods.
What collection method is the most effective? It's the tape method.
Where could you look for fibers as possible evidence? You could look on ropes, duct tape, plant debris, building materials, and wool/plant material.
What type of cuticle is crownlike and belongs to rodents? Coronal cuticle.
What type of cuticle is petallike and belongs to most cats? Spinous cuticle.
What type of cuticle is flattened and belongs to humans and other animals? Imbricate cuticle.
What would be the most incriminating way to link a suspect to a crime using individual cloth characteristics? The puzzle piece method.
What can the burn test tell you? Hints to the origin of the fiber.
What can the solvent test tell? Helps to ID a fiber.
What can you see using the microscopic test? Weave, braids, folds, twists, translucency, fraying, etc.
Why can hair be used as evidence? It contains many toxins and you can extract DNA from the follicle.
What are the 3 medulla patterns? Solid continuous, interrupted, and fragmented. Solid: - - - - Interrupted: - - - - Fragmented: - -- --- - -
What is the medullary index? It's the width of the medulla relative to the overall width of the hair.
Created by: gabbyelora
Popular Science sets

 

 



Voices

Use these flashcards to help memorize information. Look at the large card and try to recall what is on the other side. Then click the card to flip it. If you knew the answer, click the green Know box. Otherwise, click the red Don't know box.

When you've placed seven or more cards in the Don't know box, click "retry" to try those cards again.

If you've accidentally put the card in the wrong box, just click on the card to take it out of the box.

You can also use your keyboard to move the cards as follows:

If you are logged in to your account, this website will remember which cards you know and don't know so that they are in the same box the next time you log in.

When you need a break, try one of the other activities listed below the flashcards like Matching, Snowman, or Hungry Bug. Although it may feel like you're playing a game, your brain is still making more connections with the information to help you out.

To see how well you know the information, try the Quiz or Test activity.

Pass complete!
"Know" box contains:
Time elapsed:
Retries:
restart all cards