Q1. Return-to-Duty Process from a Non-DOT Test:  What are the consequences when a CDL driver tests positive on a non-DOT drug test and has not completed a return-to-duty (RTD) process with a substance abuse professional (SAP)?

A1. There is no Federal prohibition resulting from a driver testing positive on a non-DOT drug test. 49 CFR 40.13 requires that DOT and non-DOT testing be completely separate.