Here is the URL for the Companies that Drug Test. If you know of a company you should add it to help others out.
If you can't find the information you're seeking in our customer built database, then you may need to try Plan B.
Here is Plan B. Call HR (Human Resources) and ask them. Tell them you are a grad student doing a research paper on drug testing in "x" industry. If yes, then ask what kind of test. We do it all the time. Another way that you can find out is to somehow ask for or acquire a copy of the employee hand book. That should outline all their drug testing policies in there. Either way when you find out we can develop a plan for you.