7 Michigan State Police

The results of Section 7 are based on searches of the sequestered dataset Michigan State Police. This dataset consist of of 2 174 operational latent probes. No EFS data was provided for probes or mated exemplars.

All probes searched were a single friction ridge sample from somewhere on the hand. Because the ELFT API indicates to implementations whether an image comes from the distal or palm region, analysis is separated between the two.

Note: While NIST biometric technology evaluations typically use sequestered law enforcement data, a literature search indicates that this collection of data may have been supplied to other research organizations that are not subject to the same strict sequestration policies as NIST.

7.1 Failures

Table 7.1 shows the number of failures to create templates. Table 7.2 shows the number of failures to produce a candidate list.

Table 7.1: Number of failures to create templates.
Image Type Content Distal Failures Palm Failures Attempts
Exemplar Image 0 0 1 365
Probe Image 0 0 2 174
Table 7.2: Number of failures to produce a candidate list. This number includes any failures to create a probe template from Table 7.1.
Probe Content Distal Failures Palm Failures Attempts
Image 0 1 2 174

7.2 Distal Region CMC

7.2.1 Plots

The CMC in Figure 7.1 shows results from only the distal phalanx probes from Michigan State Police.

CMC when searching Michigan State Police distal phalanx probes.

Figure 7.1: CMC when searching Michigan State Police distal phalanx probes.

7.2.2 FNIR at Select Rank

The values in Table 7.3 correspond to Figure 7.1.

Table 7.3: Region FNIR values from CMC plotted in Figure 7.1.
Probe Content Rank 1 Rank  ≤ 2 Rank  ≤ 5 Rank  ≤ 10 Rank  ≤ 50 Rank  ≤ 100
Image 0.2966 0.2712 0.2459 0.237 0.2067 0.1898

7.3 Palm Region CMC

7.3.1 Plots

The CMC in Figure 7.2 shows results from only the palm probes from Michigan State Police.

CMC when searching Michigan State Police palm probes.

Figure 7.2: CMC when searching Michigan State Police palm probes.

7.3.2 FNIR at Select Rank

The values in Table 7.4 correspond to Figure 7.2.

Table 7.4: Region FNIR values from CMC plotted in Figure 7.2.
Probe Content Rank 1 Rank  ≤ 2 Rank  ≤ 5 Rank  ≤ 10 Rank  ≤ 50 Rank  ≤ 100
Image 0.2174 0.1925 0.1677 0.1615 0.1304 0.1304

7.4 Distal Region DET

7.4.1 Plots

The DET in Figure 7.3 shows results from only the distal phalanx probes from Michigan State Police. Annotated values indicate similarity scores, which are tabulated in Table 7.6.

DET when searching Michigan State Police distal phalanx probes. Annotated values indicate similarity scores.

Figure 7.3: DET when searching Michigan State Police distal phalanx probes. Annotated values indicate similarity scores.

7.4.2 FNIR at Select FPIR

The values in Table 7.5 correspond to Figure 7.3.

Table 7.5: Region FNIR values corresponding to FPIR plotted in Figure 7.3.
Probe Content FPIR = 0.01 FPIR = 0.02 FPIR = 0.1
Image 0.4287 0.3775 0.3323

7.4.3 Similarity Score Thresholds at Select FPIR

The values in Table 7.6 correspond to similarity score thresholds observed at the select FPIR values from Table 7.5.

Table 7.6: Similarity score thresholds corresponding to select FPIR values from Table 7.5.
Probe Content FPIR = 0.01 FPIR = 0.02 FPIR = 0.1
Image 7 323.24 6 697.67 6 077.4

7.5 Palm Region DET

7.5.1 Plots

The DET in Figure 7.4 shows results from only the palm probes from Michigan State Police. Annotated values indicate similarity scores, which are tabulated in Table 7.8.

DET when searching Michigan State Police palm probes. Annotated values indicate similarity scores.

Figure 7.4: DET when searching Michigan State Police palm probes. Annotated values indicate similarity scores.

7.5.2 FNIR at Select FPIR

The values in Table 7.7 correspond to Figure 7.4.

Table 7.7: Region FNIR values corresponding to FPIR plotted in Figure 7.4.
Probe Content FPIR = 0.01 FPIR = 0.02 FPIR = 0.1
Image 0.646 0.4099 0.2112

7.5.3 Similarity Score Thresholds at Select FPIR

The values in Table 7.8 correspond to similarity score thresholds observed at the select FPIR values from Table 7.7.

Table 7.8: Similarity score thresholds corresponding to select FPIR values from Table 7.7.
Probe Content FPIR = 0.01 FPIR = 0.02 FPIR = 0.1
Image 16 429 5 304 1 724