Every time we refresh the training database, we have to go disable each user. If not, they inadvertently log into training and begin to work. Created a serious issue when AP mailed checks for invoices already paid. Imagine duplicate check numbers, double payments -- it was insanely hard to resolve. The training database needs obvious, stark visual cues (siren and flashing lights would not be too much).
When users want to test or explore, I have to enable them in Training and keep checking if it's OK to disable them.