You know whether you will pass. If you will pass, sure, take the test. If you know you won’t pass, consult your lawyer. Depending on the circumstances, you may want to refuse to take the test, or admit to your drug usage. These are critical decisions and you need a professional to advise you. The main thing is to get clean! If you are using illegal drugs, find someone in your family to care for the children while you go through a inpatient program. The longer you remain in denial about your problem, the worse things will get. Remember, in a CPS case, you have one year to get your act together. It’s better to start early rather than waiting until you are out of time to save your family.