Page 203 - Automated Fingerprint Identification Systems (AFIS)

188 AUTOMATED FINGERPRINT IDENTIFICATION SYSTEMS

Table 8.3
Idents as a Percent of Latent Cases and Latent Searches

Number of Number Number
Records in of of Idents as Idents as
Lat Cog Latent Latents Number of Percentage of Percentage of
Agency Database Cases Searched Idents Cases Searches

Police Dept 1 183,000 Unk 844 79 — 9%
Police Dept 2 150,000 1,100 2,830 220 20% 8%
Police Dept 3 15,000 — 1,218 195 — 16%
Police Dept 4 190,500 1,600 1,600 375 23% 23%
Police Dept 5 200,000 2,119 5,337 1,061 50% 20%
Police Dept 6 700,000 4,732 12,450 1,374 29% 11%
Police Dept 7 245,000 — — — — —
Police Dept 8 245,000 410 1,230 127 31% 10%
State 1 741,000 3,700 6,200 419 11% 7%
State 2 220,000 2,465 4,943 357 14% 7%
State 3 1,028,000 4,700 8,015 569 12% 7%
State 4 684,000 1,055 1,748 271 26% 16%
State 5 1,089,000 7,168 21,504 781 11% 4%
State 6 1,500,000 30,000 50,000 704 2% 1%
State 7 641,000 725 4,860 158 22% 3%
Total 7,831,500 59,774 122,779 6,690 11% 5%

Table 8.4
Comparison of Two Function Agency 1 State 1
Approaches
Latents from own agency 100% 0%
Lifted by evidence technician Always Usually
Type of latents Lifts Photo
Lifter enters cases on AFIS Always Never
Search parameters Searches based on Broad, then narrow
pattern, finger number
Relaunch procedures Examiner’s option 1–3 times per case
LC database size 250,000 1,500,000
TP database size 250,000 4,300,000
Best card converted Yes No
Linked to CCH No Yes
Updates Unknown 340,000
New records annually 10,000–15,000 325,000
Records deleted 0 105,000
Latent idents counted One ident per case Multiple idents
Ident rate Only unique cases Includes multiple
searched on AFIS searches
Number of cases 410 30,000
Number of searches 1,230 50,000
Number of idents 125 700
Idents as percentage of cases 30.98% 2.35% a
Idents as percentage of searches 10.33% 1.41%
Palm prints 10–15% of Lifts Not entered
Palm prints as percentage of idents 5–7% None

a
State 1 has an ident rate of 11% when idents are counted as a percentage of new cases.