The Big 10 is odd because they consider ecstasy a performance enhancer for some reason, and under their rules two positive performance enhancer tests = disqualification from the conference, so it's not because he lied about it, it's because of the choice in drug he chose to abuse.
That's fine for you to think like that, but NFL teams do a lot more investigation and they have a lot more on the line than we do. If he comes out clean and reformed and has no signs of future drug use, that's great. Maybe the Ravens will draft him, it just doesn't seem likely given everything we know about him. It's not like this happened years ago either, his second negative test, was in 2014. He knew testing positive for ecstasy would result in a dismissal yet he still did it just months after his first suspension. Maybe getting kicked out of the conference was a wake up call, and maybe in the past 18 months he has grown up. It's just very risky to use a first round pick on a player with his history.