00615772

Component

http://onlinepubs.trb.org...trr/1991/1297/1297-004.pdf

https://scholar.google.co...ason&publication_year=1991

The accuracy of simultaneous testing for two or more drugs of abuse is analyzed. Probability theory and drug-testing accuracy concepts applicable to the testing for multiple drugs are reviewed, these concepts are applied to laboratory proficiency and transportation drug usage data, and accuracy levels are estimated that could occur in transit agency drug testing programs that simultaneously test for five different abused substances. The finding of this analysis is that as the number of drugs tested for increases, the probability that a positive test result is erroneous (the false accusation rate) increases significantly. For example, the false accusation rate when testing for five drugs is about 4 times the false accusation rate when testing for one drug. Therefore, it is suggested that if transit system decision makers wish to obtain certain maximum false accusation rates at their own organizations, they must adapt laboratory sensitivity and specificity rates for the number of drugs actually being tested for.

This paper appears in Transportation Research Record No. 1297, Public Transit Research: Management and Planning 1991. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved

01407095

Smith, Donna R

p. 20-31

1991

Transportation Research Record

0309051037

References (37) ; Tables (3)

Accuracy; Drug tests; Errors; Probability; Transit personnel

Administration and Management; Data and Information Technology; Highways; Public Transportation

TRIS, TRB

Sep 30 1991 12:00AM

• BAY AREA EMERGENCY FERRY SERVICE: TRANSPORTATION RELIEF AFTER THE OCTOBER 17, 1989, EARTHQUAKE
• CRISIS AND RECOVERY: URBAN PUBLIC TRANSPORT IN MOROCCO
• DEVELOPING MARKETS FOR TRANSIT PRIVATIZATION FOR SUBURBAN TRAVEL IN LARGE METROPOLITAN AREAS
• DIRECT-MAIL MARKETING TO NEW RESIDENTS
• MULTIVARIATE TIME-SERIES MODEL OF TRANSIT RIDERSHIP BASED ON HISTORICAL, AGGREGATE DATA: THE PAST, PRESENT AND FUTURE OF HONOLULU (WITH DISCUSSION AND CLOSURE)
• PRIVATIZATION OF URBAN TRANSIT: A DIFFERENT PERSPECTIVE
• REGULARITY INDICES FOR EVALUATING TRANSIT PERFORMANCE
• SUBWAY RELIABILITY AND THE ODDS OF GETTING THERE ON TIME
• TEMPORAL EFFECTS OF INCIDENTS ON TRANSIT RIDERSHIP IN ORANGE COUNTY, CALIFORNIA
• THE I SYSTEM: A CAMPUS AND COMMUNITY BUS SYSTEM FOR THE UNIVERSITY OF ILLINOIS AT CHAMPAIGN-URBANA
• TRANSIT-SENSITIVE SUBURBAN LAND USE DESIGN: RESULTS OF A COMPETITION
• TRANSITTOPICS: BOSTON'S NEIGHBORHOOD TRANSIT SERVICE WORKSHOP PROGRAM
• TUALATIN PARK-AND-RIDE LOT PROGRAM EVALUATION
• UNJUST EQUITY: AN EXAMINATION OF CALIFORNIA'S TRANSPORTATION DEVELOPMENT ACT