https://www.123articleonline.com/rss/author/166463/dustin-parksArticles written by Dustin Parks from 123ArticleOnline.comen-usCopyright (c) 123ArticleOnline.com All rights reserved. https://www.123articleonline.com/articles/1124053/who-must-submit-to-post-accident-testing-and-when In most cases, when a traffic citation is issued it becomes necessary to test all CDL holders involved, even if they were not the recipient of the citation. https://www.123articleonline.com/articles/1124079/who-must-submit-to-pre-employment-testing-among-commercial-drivers Holders of commercial drivers' licenses (CDLs) are required by federal law to be tested for drug use as a condition for hiring. Employers oversee the testing.