Yeah, good point. The OP could be read that way.
People with ADHD tend to have low levels of dopamine, which is why THC can feel so rewarding. Learn more about the link between marijuana and ADHD.
www.verywellmind.com
As mentioned above, the perception that marijuana is therapeutic for ADHD is growing in popularity. For example, a 2016 qualitative analysis of online discussions around cannabis use and ADHD confirmed this trend, finding that overall online discussions indicated that cannabis is considered therapeutic for ADHD.
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Still, while this view may be gaining popularity over the internet, there is little clinical support for these claims. Research has shown that marijuana use is connected to worse executive function and greater IQ deficits. In addition, a 2019 medical review of 83 studies on the matter found that there was insufficient evidence on the effectiveness of cannabis in treating mental health conditions, including ADHD.
Would he have passed without pot? Maybe, maybe not.
Too late now. He'll have to have two years clean (and documented), then try again. He should have known better; guess maybe he just didn't pay attention....