Am I able to conduct Non-DOT screenings if I am a qualified DOT urine specimen collector?
You should take the Non-DOT course to understand the differences between DOT and Non-DOT including rapid testing. If you do not have plans of conducting rapid testing, then this certificate should suffice.
The purpose of taking the Non-DOT course is to fully understand the laws of the specific state that you are conducting drug tests in. Remember, DOT falls under Federal laws while Non-DOT is particular to each state.