e than 650,000 tests from January to December, 1998)Drug Category19981997Amphetamines0.25%0.30%Cocaine0.78%0.73%Marijuana1.87%2.0%Opiates0.49%0.53%PCP0.05%0.04%Positive Rates By Drug Category(For General U.S. Workforce, as a percentage of all such tests)(More than 5 million tests from January to December, 1998)Drug Category19981997Amphetamines0.20%0.26%Barbiturates0.38%0.35%Benzodiazepines0.55%0.59%Cocaine0.91%0.90%Marijuana3.17%3.4%Methadone0.06%0.07%Opiates0.50%0.50%PCP0.01%0.01%Propoxyphene0.29%0.27%(Johnson)EXHIBIT 3Positive Results By Drug Category(For Federally Mandated, Safety-Sensitive Workers, as a percentage of all positives)(More than 650,000 tests from January to December, 1998)Drug Category19981997Amphetamines7.1%8.1%Cocaine22.3%20%Marijuana54.7%56%Nitrites0.32%NA%Opiates14%15%PCP1.6%1.2%Positive Results By Drug Category(For Combined U.S. Workforce, as a percentage of All Positives)(More than 5.7 million tests from January to December, 1998)Drug Category19981997Amphetamines4.0%4.9%Barbiturates3.0%3.0%Benzodiazepines3.4%3.9%Cocaine17.6%16%Marijuana59.2%60%Methadone0.36%0.41%Methaqualone0.0007%0.0002%Nitrites0.63%NA%Opiates9.7%9.4%PCP0.37%0.34%Propoxyphene1.7%1.6%Rates By Testing Positivity Reason(For General Workforce)(More than 5 million tests from January to December, 1998)Testing Reason19981997For Cause25.3%26.7%Periodic4.9%5.2%Post-Accident6.4%6.8%Pre-Employment4.6%4.7%Random7.3%8.3%Returned to Duty7.2%6.1%(Johnson)EXHIBIT 4 EXHIBT 5(Johnson) (Johnson)Exhibit 6...
