Unsupervised probation does not mean that your information will not come back to a PO. It just means that you weren't being monitored to the degree that a reporting offender would be. However, drops will be sent to the agency and recorded. That means that someone who in the capacity of a probation officer will get your dirty drop. There is no need to hide it. Inevitably, it will come out. The question is do you want to admit to it? Or do you want to risk the department coming down harder because you prolonged divulging it?