Paper Chromatography
What is chromatography?
It separates colored chemicals
Who developed the system of using different body measurements to be distinguished from others?
Alphonse Bertillion
What is Follicular tissue?
The tissue of hair necessary for DNA analysis!
What is the name of evidence that could be used to imply a fact but does not prove anything alone?
Circumstantial Evidence!
What is a primary scene?
Place where the crime took place!
What do inks separate to?
They separate to their solubility. (Which is being able to dissolve in the mobile phase)
Edmond Locard came up with the idea that when a criminal comes in contact with an object or a person a _________ of evidence occurs
"Cross-transfer"
What is the medulla?
In making hair evaluations, it is best to view this part of the hair using a microscope.
Direct Evidence.
Somethings you must NEVER do at the crime scene:
-Do NOT touch anything or have anyone else touch things, it can be useful in court
-Do NOT clean anything, again can be useful in court
What phase do Paper Chromo use?
Stationary and mobile!
Which of the following developed the first DNA profiling test, Albert Osborn, sir Alec Jefferys, or Calvin Goddard?
Sir Alec Jefferys
Doing analytical testing using hair can detect usage of __________.
Drugs
FREE SPACE!!!
FREE SPACE!!!
How do you secure evidence at a crime scene?
Properly secure the evidence by placing in a paper bag or envelope. Close, seal, or tape the paper bag or envelope. The examiner must initial, date, and time across the sealed area
We use paper Chromatography in the Forensic unit to:
used as a qualitative analytical chemistry technique for identifying and separating colored mixtures like pigments.
Who developed a procedure to determine the blood group of a dry blood stain?
Leone Lattes
A cast of a hair surface can be made using one of these two materials: softened vinyl and____________
Clear nail Polish!
Would Blood be class evidence or individual evidence?
Class evidence!
What is the "secondary" crime scene?
Place "outside" the primary crime scene or related to the crime but not the actual location of the crime .
What does the mobile phase of Chromatography do?
The mobile phase flows through the packed bed or column.
Who was the author of Sherlock Holmes, who also studied ballistics and fingerprinting and document examination?
Sir Arthur Conan Doyle
Microscopic hair comparisons must be regarded by police and courts as ___________ type of evidence.
Presumptive!
What is the difference between Class and Individual evidence?
Individual- Material that is used to make a direct id of a person
Class- Material that is used to connect an object or person to a group
What is Trace evidence?
Small but measurable amounts of biological or physical evidence found at crime scenes!