Untitled Flashcards Set

Medullary Index Differences

In animals, the medullary index is usually greater than 0.5, while in humans it is typically less than 0.33.

Natural vs Synthetic Fibers

Examples of natural fibers include cotton and wool; synthetic fibers include polyester and nylon.

Comparison of Fibers

Natural fibers generally have lower filament counts and retain water better than synthetics, whose flame tests differ by melting instead of burning.

Impression Characteristics

Class characteristics are general traits (shoe size), while individual characteristics are unique marks (specific wear patterns) found in impressions.

Types of Impressions

Types of impressions found at a crime scene include shoeprints, tire treads, and tool marks.

Matching Impressions

One would compare an impression to a standard reference by looking for specific patterns, sizes, and individual characteristics.

Forensic Analysis of Shoes

Shoes are forensically analyzed by examining the tread patterns, sizes, and wear characteristics, comparing them to known shoe databases.

Handwriting Examination Points

The 12 points of handwriting examination include line quality, spacing, and pressure.

Identical Handwriting

No two handwriting samples can be identical due to individual variations and personal writing styles.

Requested vs Collected Samples

Requested samples are written under specific conditions, while collected samples are taken from existing documents.

Analyzing Paper

Paper is analyzed through its physical characteristics such as thickness, weight, and composition.

Using Rf to Compare Ink

Rf (retention factor) is used to compare the distance traveled by ink on a chromatogram from a questioned document to that of a suspect's pen.