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San
Diego County Probation
Pupillometer
Pilot Study – Summary of Results
The
EyeCheckä pupillometer pilot was conducted
during November 2001. The goal of the pilot program was to compare
the findings of test results using both the EyeCheckä pupillometer and urinalysis screening.
Norchem Laboratories conducted the urine tests at a zero
cutoff level at prescreening.
The
following people were not included in the study results.
·
Juveniles
·
Pregnant
offenders
·
Those
offenders who have had RK or Lasek Surgery within two weeks of
the test.
·
Offenders
over age 50
- Offenders
that have suffered from an eye or head injury.
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Positives
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19
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Negatives
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82
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False Positives
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29
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False Negatives
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4
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Inconclusive Negatives
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8
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Inconclusive Positives
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4
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Exams
analyzed...…………………146
False
positives (tests positive on the pupillometer and negative on
urine) include samples that were positive on urine screens below
NIDA threshold for “positive.”
The
critical result for “false negatives” (tests negative
on pupillometer and positive on urine) was 3 percent. Both false
negatives and false positives, are expected to be even less as
we gain experience using the device.
The
Eye Check™ pupillometer system must be considered strictly
a “screening device” to better utilize our urine testing
resources. Where applied, EyeCheck™ pupillometer will reduce
the number of urine tests needed by 56 percent. If used for all
testing in Probation, this would mean about $150,000 a year in
savings.
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