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Significance of Class Significance of Class Association of Shoe PrintsAssociation of Shoe Prints
Sandy ParentSandy Parent
Texas Department of Public SafetyTexas Department of Public Safety
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What is the likelihood that What is the likelihood that two people would have a two people would have a
shoe similar in tread shoe similar in tread pattern, size and wear and pattern, size and wear and wear the shoe to the same wear the shoe to the same
place on the same day?place on the same day?
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Random Population Random Population
Various ages Various ages Males and Females Males and Females Various professions Various professions Various income levelsVarious income levels Various originsVarious origins
= Many different types of footwear = Many different types of footwear
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Texas Department of Public Texas Department of Public Safety Driver’s License Safety Driver’s License
BuildingBuilding Study 1: Study 1: July 2004 (3 July 2004 (3 days)days)
AustinAustin
Study 2:Study 2: March 2005 (2 days)March 2005 (2 days) AustinAustin GarlandGarland HoustonHouston LubbockLubbock McAllenMcAllen
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Austin▲ Houston
▲ Garland
▲ Lubbock
▲
McAllen
Austin
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Collection Collection Individuals were asked to participate in Individuals were asked to participate in
studystudy Right shoe sole Right shoe sole Documented information: Documented information:
ManufacturerManufacturer Style (Dress, Casual, Athletic, Sandal, Style (Dress, Casual, Athletic, Sandal,
Boot)Boot) SizeSize Male / FemaleMale / Female
““Invisible Ink” Method – Armor HoldingsInvisible Ink” Method – Armor Holdings
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Invisible Ink MethodInvisible Ink Methodby Armor Holdingsby Armor Holdings
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1607 Shoe Prints1607 Shoe Prints Study 1 – Study 1 –
July 2004 – 3 days July 2004 – 3 days
Austin, TXAustin, TX
555 Shoe Prints555 Shoe Prints
Study 2 – Study 2 –
March 2005 – 2 DaysMarch 2005 – 2 Days
236 Shoe Prints / Austin236 Shoe Prints / Austin
205 Shoe Prints / Garland205 Shoe Prints / Garland
236 Shoe Prints / Houston236 Shoe Prints / Houston
181 Shoe Prints / Lubbock181 Shoe Prints / Lubbock
194 Shoe Prints / McAllen194 Shoe Prints / McAllen
Total – Total – 1052 Shoe Prints1052 Shoe Prints
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Study 1 – 555 Shoe PrintsStudy 1 – 555 Shoe Prints
Athletic Shoes – Athletic Shoes – 207207
Sandal – 204Sandal – 204 Casual – 84Casual – 84 Boot – 32Boot – 32 Dress – 27Dress – 27 Unknown – 1Unknown – 1
0%5%
10%15%20%25%30%35%40%
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Study 2 – 1052 Shoe PrintsStudy 2 – 1052 Shoe Prints
Athletic – 430Athletic – 430 Sandal – 129Sandal – 129 Casual – 261Casual – 261 Boot – 133Boot – 133 Dress – 99Dress – 99
0%5%10%15%20%25%30%35%40%45%
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Study ComparisonStudy Comparison
0%
5%10%
15%
20%25%
30%
35%40%
0%5%10%15%20%25%30%35%40%45%
Study 2
Study 1
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OVERALL – 1607 Shoe PrintsOVERALL – 1607 Shoe Prints
Athletic – 637Athletic – 637 Sandal – 333Sandal – 333 Casual – 345Casual – 345 Boot – 165Boot – 165 Dress – 126Dress – 126 Unknown - 1Unknown - 1
0%5%10%
15%20%25%
30%35%
40%
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Market AnalysisMarket Analysis
Athletic Athletic Nike 157Nike 157 New New
Balance Balance 6565
Reebok 60Reebok 60 Adidas 41Adidas 41 K Swiss 26K Swiss 26 Skechers Skechers
3232
CasualCasual Skechers Skechers
1818 Polo 16Polo 16 Rockport 15Rockport 15
SandalsSandals Reef 21Reef 21 Old Navy Old Navy
1818
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Male Shoe SizesMale Shoe Sizes
Size 7 – 18Size 7 – 18
Size 7.5 – 23Size 7.5 – 23
Size 8 – 43Size 8 – 43
Size 8.5 – 59Size 8.5 – 59
Size 9 – 102Size 9 – 102
Size 9.5 – 80Size 9.5 – 80
Size 10 - 105Size 10 - 105
Size 10.5 – 95Size 10.5 – 95
Size 11 – 91Size 11 – 91
Size 11.5 – 32Size 11.5 – 32
Size 12 – 86Size 12 – 86
Size 12.5 – 3Size 12.5 – 3
Size 13 – 51Size 13 – 51
Size 14 - 13Size 14 - 13
* Based on information provided by participant
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Female Shoe Sizes Female Shoe Sizes
Size 5 – 19Size 5 – 19
Size 5.5 - 22Size 5.5 - 22
Size 6 – 46Size 6 – 46
Size 6.5 – 44Size 6.5 – 44
Size 7.0 - 114Size 7.0 - 114
Size 7.5 – 77Size 7.5 – 77
Size 8 – 107Size 8 – 107
Size 8.5 – 73 Size 8.5 – 73
Size 9 – 81Size 9 – 81
Size 9.5 – 29Size 9.5 – 29
Size 10 - 39 Size 10 - 39
Size 10.5 – 3Size 10.5 – 3
Size 11 – 13Size 11 – 13
* Based on information provided by participant
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““Class CharacteristicClass Characteristic – An – An intentional or unavoidable intentional or unavoidable
characteristic that repeats during characteristic that repeats during the manufacturing process and is the manufacturing process and is
shared by one or more shoes”shared by one or more shoes”
- Bodziak, William - Bodziak, William Footwear Impression Evidence Detection, Recovery, and Footwear Impression Evidence Detection, Recovery, and
ExaminationExamination
Tread Pattern, Size and Wear Tread Pattern, Size and Wear
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Tread PatternTread Pattern Gross DesignGross Design
Variation in the Manufacturing Variation in the Manufacturing ProcessProcess Mold vs. CutMold vs. Cut
TextureTexture StipplingStippling Chemical Acid EtchingChemical Acid Etching
Limitations Limitations Featureless solesFeatureless soles Large amount of wearLarge amount of wear Partial imprintsPartial imprints
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Elimination – Tread PatternElimination – Tread Pattern
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Elimination – Tread PatternElimination – Tread Pattern
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Elimination – Tread PatternElimination – Tread Pattern
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Elimination – Tread PatternElimination – Tread Pattern
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Elimination - Tread PatternElimination - Tread Pattern
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Elimination – Tread PatternElimination – Tread Pattern
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Elimination – Heel TreadElimination – Heel Tread
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Elimination - Tread PatternElimination - Tread Pattern
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Size / DimensionsSize / Dimensions
Physical Dimensions of the imprintPhysical Dimensions of the imprint Not related to the manufacturer sizeNot related to the manufacturer size Superimpose imprints (Overlay Superimpose imprints (Overlay
Method)Method) Limitations –Limitations –
Partial imprintsPartial imprints Heavily saturated imprintsHeavily saturated imprints
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Elimination – Size Elimination – Size
ReebokSize 8
M
ReebokSize 2.5
M (Youth)
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WearWear The effect of frictional or abrasive The effect of frictional or abrasive
forces on the shoe soleforces on the shoe sole The removal of portions of the design The removal of portions of the design Noticeable differences in the worn Noticeable differences in the worn
versus unworn areas of the shoesversus unworn areas of the shoes Position and degree of wearPosition and degree of wear Schallamach PatternSchallamach Pattern Limitations:Limitations:
Undefined or minimum amount of wearUndefined or minimum amount of wear Heavily saturated imprintHeavily saturated imprint
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Schallamach PatternSchallamach Pattern
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Elimination by WearElimination by Wear
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Elimination - WearElimination - Wear
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Elimination – Overall SizeElimination – Overall Size
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Old Navy – Flip FlopsOld Navy – Flip Flops
13 Shoes / 78 Possible Pairs
Indistinguishable Pairs: Tread - 4 Size / Dimensions - 2 Wear - 0
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Reebok8 shoes
Reebok3 shoes
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Manufacturer: SkecherNumber Collected: 10Possible Pairs: 45
Indistinguishable Pairs:
Tread Pattern – 45 pairsSize – 1 pairWear - 0
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Manufacturer: New BalanceNumber Collected: 8 Possible Pairs: 28
Indistinguishable Pairs:
Tread Pattern – 28 pairsSize - 0Wear – Not Applicable
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Manufacturer: New BalanceNumber Collected: 7Possible Pairs: 21
Indistinguishable Pairs:
Tread Pattern – 6 Size - 0Wear – Not Applicable
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Tread Pattern - EliminationTread Pattern - Elimination
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ComparisonComparison Local PopulationsLocal Populations Total PopulationTotal Population
Assess the Significance based on:Assess the Significance based on: Toe AreaToe Area
Tread design Tread design Size/Dimensions Size/Dimensions Wear Wear Toe + Heel Toe + Heel AreaArea
Tread design Tread design Size/Dimensions Size/Dimensions Wear Wear
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Study 1 - 2004555 Shoe Prints
153735 Possible Matches
Toe Toe + Heel
Tread Pattern -122 (81)
Size / Dimensions -
91 (81)
Tread Pattern -35 (0)
Size / Dimensions -
0 (0)
Wear -16 (15)
Wear -Not Applicable
*( ) = Featureless soles
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Indistinguishable PairsIndistinguishable Pairs
04 0.02%
N/A2 0.01%
05 0.02%
06 0.03%
N/A 90.03%
WearWear
20.01%
350.19%
0180.11%
1 0.0%
25 0.09%
3 0.01%
180.08%
020 0.07%
Size Size
16 0.09%
430.23%
11 0.07%
290.18%
24 0.09%
440.16%
240.11%
360.17%
70.03%
300.11%
TreadPattern
TreadPattern
194 / 18721
181 / 16290
236 / 27730
205 / 20910
236 / 27730
McAllen
Lubbock
Houston
Garland
Austin
# prints /possiblepairs
Toe and HeelToe
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*( ) = Featureless soles
1607 Shoe Prints1290421 Possible Pairs
Toe Toe + Heel
Tread Pattern -1521 (961)
Size / Dimensions -1079 (961)
Tread Pattern -536 (29)
Size / Dimensions -
38 (10)
Wear -252 (232)
Wear -0
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Indistinguishable PairsIndistinguishable PairsToe Toe and Heel
# ofimprints
/Possiblepairs
TreadPattern Size Wear
TreadPattern Size Wear
Study 1555 /153735
1220.08%
910.06%
16 0.01%
35 0.02% 0 N/A
Study 21052 /552826
873 0.16%
621 0.11%
155 0.03%
312 0.06%
25 0.005% 0
Overall1607 /1290421
1521 0.12%
1079 0.08%
252 0.02%
536 0.04%
38 0.003% 0
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What is the likelihood that What is the likelihood that two people would have a two people would have a
shoe similar in tread shoe similar in tread pattern, size and wear and pattern, size and wear and wear the shoe to the same wear the shoe to the same
place on the same day?place on the same day?
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State of Alaska Crime LabState of Alaska Crime Lab-Lesley Hammer & Janeice -Lesley Hammer & Janeice
AmickAmick Collected right shoe imprint from 353 Collected right shoe imprint from 353
individuals at the local DMV in 2006 individuals at the local DMV in 2006 Majority appeared to be athletic footwearMajority appeared to be athletic footwear Unable to infer age of person from shoe Unable to infer age of person from shoe
imprints imprints Similar design worn by 15 year old & 45 year oldSimilar design worn by 15 year old & 45 year old Similar design and size worn by 44 yo & 77 yoSimilar design and size worn by 44 yo & 77 yo
Results – 1 pair was determined to be Results – 1 pair was determined to be indistinguishable based on design and sizeindistinguishable based on design and size Adidas – size 7.5 – 16 year oldsAdidas – size 7.5 – 16 year olds Appeared to have same stippling in a small area Appeared to have same stippling in a small area
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Special Thanks To:Special Thanks To:
Allen Miller – Armor ForensicsAllen Miller – Armor Forensics Christi Wells & Greg JellikChristi Wells & Greg Jellik Micheal Villarreal, Jose Zuniga, Devin Micheal Villarreal, Jose Zuniga, Devin
Crago and Lan Bundy Crago and Lan Bundy TX DPS ManagementTX DPS Management William Bodziak William Bodziak
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Contact InformationContact Information
Sandy ParentSandy Parent
P.O. Box 4143 MSC 0460P.O. Box 4143 MSC 0460
Austin, TX 78765-4143Austin, TX 78765-4143
(512) 424-2105 (512) 424-2105
[email protected]@txdps.state.tx.us