Must Know

Question 1

What is the Philosophy of Footwear Identification as stated by Michael Cassidy?

Answer 1

Footwear Identification is established by agreement of class characteristics and accidental characteristics of such significance or number that no other logical conclusion can be reached

Question 2

What are the basic premises upon which fingerprint identification is based?

Answer 2

• friction ridges develop on the fetus in their definitive form before birth
• friction ridges are persistent throughout life except for permanent scarring and disease
• friction ridge patterns and the details in small areas of friction ridges are unique and never repeated.
• overall friction ridge patterns vary within limits which allow for classification

Question 3

What is the philosophy of fingerprint identification?

Answer 3

Friction ridge patterns are established through the agreement of friction ridge formations in sequence with sufficient uniqueness to identify

Question 4

Alfred Hale was a critical researcher who provided information in regards to the embryological growth information of the friction skin. His measurements in terms of age were noted in crown to rump length what would these critical times of friction Ridge skin development B if they were stated in weeks (outline, each key stage of development)

Answer 4

• 3 weeks - epidermis is one cell thick
• 6 weeks - The hand is paddle like, some volar pads are starting to appear
• 8 weeks - The fingers have separated and elongated
• 10 weeks - The interdigital and digital pads are prominent and the thumb has rotated.
• 10 to 12 weeks - Flexion creases appear
• 10 to 13 weeks and onward - Volar Pads regress or are absorbed by the growth of the hands
• 12 to 13 weeks and onward - primary ridges begin to form at the bottom of the epidermis, each primary ridge unit develops pores
• 15 to 16 weeks and onward - secondary ridges begin to form at the bottom of the epidermis ceasing the development of the primary ridges
• 17 to 20 weeks - The process is complete, time of differentiation, final configuration of ridges is established following the development of the dermal papillae filling voids between primary and secondary ridges.