There were a lot of problems with form 420. Not least of which that people qualified to be flying instructors were expected to do the job of a clinical psychologist and apply a questionairre written for children to adults.
It has to be the most ludicrous and discriminatory thing I have ever seen them do.
Where are the accident statistics that show that ADHD is a contributing factor? I don't recall any such findings in any ATSB reports.
Let's hope Form 420 will never see the light of day again and those who were deemed to have a "disorder" that made them "unsafe" will be able to try again to get a medical.