Seriously. The fact that this is treated as less of an issue than the guys who fail drug tests is, at best, a little messed up.
Mitigated, of course, by the fact that the charges were dropped, and innocent until proven guilty and all that.
Why is it messed up?
One is a workplace issue, compliance with the drug policy and integrity of competition.
Another is a personal life issue that doesn't impinge the game itself, merely Sullinger's character given that the charges have been dismissed.
Punishing employees for issues in their personal life is something that's fraught with peril for an employer.
I think we're talking about different drug tests. 
To that end, I think we're both talking about things that can be easily classified as "a personal life issue that doesn't impinge on the game itself."
Another topic for another thread (but not at CB, I don't believe).
The 70s and 80s proved that recreational drug use were as big concern for the game's integrity and level of competition as performance enhancers. (NBA cares more about recreational drugs than performance IMO)
Death, failure to perform at high levels, and draft busts galore because of them.
While you are not inaccurate when you use the umbrella of "recreational drugs", no NBA players have died from marijuana use. Nor can you definitively attribute a failure to perform at a high level to use of marijuana. There is a big difference between marijuana and other recreational drugs -- and the NBA acknowledges such in their policies. The suspension for a third violation of marijuana use is 5 games. Substances like cocaine result in a dismissal from the NBA.
I'm assuming that marijuana is the type of drug test that D.o.s. was referring to and I agree that it's messed up that marijuana use is punished 5x higher than domestic violence here. There may be an argument to be made as well for the discrepancy of punishments between domestic violence and "hard drug" use as well.
So you set a limit on the # of games one gets for hitting their girlfriend/wife, then you have to justify suspending a player for a season when he simply hit another man in the audience?
The idea here is that discrepancy of punishment is based on the league/team's image being harmed, not on how bad the act itself is. Otherwise the league would be forced to defend why JR Smith killing someone is only worth
this many games. How do you figure out "how many time worse" that is than marijuana use? And where do you draw the line?
It's an argument that the NBA doesn't want or need to get into. How do you decide how many less games you get if you test positive for marijuana with a medical marijuana license because you can't be found guilty in a court of law? At a certain point you just have to accept, as a sports fan, that any suspension is just a slap on the wrist to filthy rich athletes most of who live less than ethical lives (caught or not) and we just ignore it in the sake of entertainment.