Most probation offices use urine tests or inferior kits, which are prone to false results.  To challenge them, I would suggest that you go and take a hair follicle test with a lab that has experience in the jurisdiction where your criminal case is being handled.  This could help prove that you have not used recently or in the last 90 days.To put a halt on your sanctions, you need to file a motion for reconsideration if the order has already been signed.  If you can afford an attorney, it would be best to hire one to advocate for you since judges do not generally like delaying their sanction orders.