The parent isn't referring to juicing with medication, rather seeking a diagnosis in order to receive accommodations like extra exam time [0].
The most notable example of this is probably the 2000 California audit:
" An analysis of the numbers from the report yielded the following figures: white students were over-represented by 45%, students coming from families whose incomes exceed $100,000 were over-represented by 139%, and students from private schools were over-represented by 100%. The report also concluded that 18.2% of the requests granted were of “questionable” merit and gave students an “unwarranted” and “unfair” advantage. The report cited weaknesses in the College Board’s approval process as the cause of some of the unfair distribution." [1]
In the meantime it actually became more desirable...
"A 2000 audit of California test takers showed a disproportionate number of white, affluent students receiving accommodations, igniting suspicions of exaggerated or nonexistent disabilities. Three years later, in the wake of a lawsuit, ACT and the College Board stopped flagging scores of accommodated students for admissions offices; with the stigma gone, the incentive grew to game the system." [2]
0: https://professionals.collegeboard.com/testing/ssd/accommoda...
1: https://www.applerouth.com/blog/2006/04/27/extended-time-and...
2: http://www.nytimes.com/2010/11/07/education/edlife/07strateg...