I think it'd be accurate to say it's unresolved. The government agencies alleged to have been involved obviously had a powerful interest in refuting the claims. And it's a little hard to believe that while the CIA was engaged in arms dealing and other shenanigans in Central America they would never get involved with drugs. I would avoid interpreting the conclusions of heavily redacted reports with too much confidence.

Nice link. Browsing the related articles is interesting. I wasn't aware that the CIA was alleged to have trafficked opium during their secret and illegal war in Laos. Good to know.