Don’t let it happen at all. Don’t allow anyone to give them that label. Don’t let anyone “test” their child for it since there is no objective test. When parents told the teacher that their child was taking ADHD drugs, but actually did not give them to the child at all, 90% of the time the teachers thought the child was better just because they thought the child was taking a drug. It looks like a placebo for the teacher to me.