The only people whose drug use you can be sure about are those who were around before the drug was invented, and the guy you see in the mirror. For everyone else you are guessing.
It's surprising that True Adonis is so unscientific in his approach to this topic.
And the comments about skin quality are pretty funny too. Always a similar claim, but never any specific details: "you see the difference in skin quite obviously." If the differences are so obvious, then surely you would be able to give a good description of what you're seeing, and those differences should be visible to other people?
"Skin pressed to lean tissue" is not nearly specific enough.
I wonder if you can see these skin differences when only shown a small area of skin (or one muscle and a couple of veins)? Looking at skin alone I honestly doubt you could even tell male from female, let alone one drug effect from another.