1. Report for duty or remain on duty having an alcohol concentration of 0.02 or greater;

2. Report for duty within four hours of using alcohol or controlled substances;

3. Use alcohol or controlled substance while on duty, including during breaks or meals;

4. Possess alcohol or controlled substances while on duty, including during breaks or meals;

5. Use alcohol for eight hours following an accident, or until the employee undergoes a post-accident alcohol or controlled substance test, whichever occurs first;

6. Refuse to take an alcohol or controlled substance test when ordered by the city;

7. Report for duty or remain on duty using any drug or substance, identified in 21 CFR 1308.11 Schedule I;

8. Report for duty or remain on duty using any non-Schedule I drug or substance that is identified in the other schedules in 21 CFR 1308 except when the use is a licensed medical practitioner, as defined in this chapter, who is familiar with the employee’s medical history and has advised the employee that the substance will not adversely affect the employee’s ability to safely perform their work functions;

9. Report for duty, remain on duty or perform, if the employee tests positive or has adulterated or substituted a test specimen for controlled substances. No employer having knowledge that an employee has tested positive or has adulterated or substituted a test specimen for controlled substances shall permit the employee to perform their work functions.