For each of the following impressions, determine which characteristics are class characteristics and which are individualizing characteristics
a. Screwdriver pry mark: 0.5 inch wide, filings of stainless steel imbedded in mark, rounded edges, center half-circle groove, 3 wide striations near one edge, 7 narrow striations near one edge
b. Two-dimensional footwear impression: Nike brand, 11 inches long, wear pattern on back outside edge, 4 inches wide at arch, gouge at back heel, "Nike Air" imprinted on arch
c. Recovered bullet: .22 caliber, deep striation in one land, left-handed twist, 13 fine striations in one groove, 5 grooves around periphery, 79% lead composition
What will be an ideal response?
Answer:
a. Class: 0.5 inch wide, filings of stainless steel imbedded in mark, rounded edges, center half-circle groove
Individual: Three wide striations near one edge, 7 narrow striations near one edge
b. Class: Nike brand, 11 inches long, 4 inches wide at arch, "Nike Air" imprinted on arch
Individual: Wear pattern on back outside edge, gouge at back heel
c. Class: .22 caliber, left-handed twist, 5 grooves around periphery, 79% lead composition
Individual: Deep striation in one land, 13 fine striations in one groove
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