This is called a pre-employment drug test. The one exception is if you have been working as a CDL driver and have been on another Random Drug Test Roster leading up to your employment at ROW. (IE: working as a bus driver for a school district)
You will need a Letter of Introduction from the Operations Admin to give to the clinic conducting your test.
A ROW Operations Manager or Admin will reach out to you, letting you know you have been selected for a random drug screening. They will provide you with a LOI. You will give this to the clinic you are getting the drug test preformed at.