Its the main reason legal states can pass off shitty but well trimemd bud as good shit. They dont even cure it.
So regular street weed is mashed, seedy, stick-laden, ill-trimmed, low THC crispy brown or extremely light green. Probably not taken care of well with zero cure, dried in 15% humidity over 3 days. Or my best guess.
Dro refers to Hydroponic. Medical grade has been grown close to 32% THC, trimmed well, very minimal sticks, no seeds, handled gently, well cured for over 2 weeks (1 month or more preferably)
My opinion.