When required, Post-Accident tests must be conducted as soon as practicable. If a test is not administered within two hours, the employer must prepare and maintain a file stating the reasons why a test was not promptly conducted. The employer must also continue to attempt to administer a Post-Accident alcohol test for up to eight hours and the Post-Accident controlled substances test for up to 32 hours after an incident. You must document the failure to conduct a Post-Accident test on your MIS report.