Don't get me wrong I understand it was a different time. Hell, my Company Commander in Boot "survived" a DUI and still made Chief. But he also made sure it was perfectly clear that he was lucky and would never see Senior.
Dude, you don't understand.

If you were only drunk you got an ass chewing and that was it, if it happened a couple time you got sent to D&A classes.
I never heard of any one getting in trouble for being under the influence of drugs and I saw a guy talk his way out of having an ounce of weed fall out of his pant leg during a company formation.
He didn't even get an Art. 15.
And for TAB, the dogs weren't worth a crap.
I will tell of one time they brought them through our barracks, afterward one of the guys was talking with the dog handler making of the dog, just BSing about the training, and dog stuff, (he had hunting dogs ) When the dog handler and every one had left he went over to his locker and dropped off the 4 ounces of pot he had in his cargo pockets.