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 88 1 365
Probe Image 21 161 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.
Distractor Imp. Probe Content Distal Failures Palm Failures Attempts
Plain Image 29 161 2 174
Roll Image 29 161 2 174

7.2 Distal Region CMC

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, faceted by distractor impression type.

Figure 7.1: CMC when searching Michigan State Police distal phalanx probes, faceted by distractor impression type.

The values in Table 7.3 correspond to Figure 7.1.

Table 7.3: Region FNIR values from CMC plotted in Figure 7.1.
Distractor Imp. Probe Content Rank 1 Rank  ≤ 50 Rank  ≤ 100
Plain Image 0.8152 0.7198 0.6995
Roll Image 0.7839 0.6811 0.6632

7.3 Palm Region CMC

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, faceted by distractor impression type.

Figure 7.2: CMC when searching Michigan State Police palm probes, faceted by distractor impression type.

The values in Table 7.4 correspond to Figure 7.2.

Table 7.4: Region FNIR values from CMC plotted in Figure 7.2.
Distractor Imp. Probe Content Mated Content Rank FNIR
Plain Image Image NA NA
Roll Image Image NA NA

7.4 Distal Region DET

The DET in Figure 7.3 shows results from only the distal phalanx probes from Michigan State Police.

DET when searching Michigan State Police distal phalanx probes, faceted by distractor impression type.

Figure 7.3: DET when searching Michigan State Police distal phalanx probes, faceted by distractor impression type.

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.
Distractor Imp. Probe Content FPIR = 0.01 FPIR = 0.02 FPIR = 0.1
Plain Image 0.4579 0.4099 0.2661
Roll Image 0.4749 0.4277 0.2847

7.5 Palm Region DET

The DET in Figure 7.4 shows results from only the palm probes from Michigan State Police.

DET when searching Michigan State Police palm probes, faceted by distractor impression type.

Figure 7.4: DET when searching Michigan State Police palm probes, faceted by distractor impression type.

The values in Table 7.6 correspond to Figure 7.4.

Table 7.6: Region FNIR values corresponding to FPIR plotted in Figure 7.4.
Distractor Imp. Probe Content FPIR = 0.1 FPIR = 0.01 FPIR = 0.02
Plain Image NA NA NA
Roll Image NA NA NA