What's the difference between a strong willed child and an add/adhd child?

My friend told me that some parents give their strong willed kids add/adhd meds even though the doctor never diagnosed them with add/adhd.

So what's the difference between a strong willed child and an add/adhd child?
Well then how does a child who doesn't have add get the doctor to say he/she has add? does the parents LIE about the

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