Is the US government involved in drug trafficking?

Yes, that is why they want it to stay illegal, so they can keep their secret stashe.

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Yes, they have been involved for many years. The Iran Contra Affair and the Kerry Comittee Report should be reviewed for more details. Ex DEA chief for Central America, Celerino Castillo testified against the federal government's involvement in drug trafficking during the 1980's. He was fired because he blew the whistle on the government's drug involvement. The federal government puts undercover agents in Colombia to destroy the planes carrying drugs for traffickers who are not part of the government's operations. They put bombs on the planes that exploded when the planes reached a certain altitude, leaving few traces or evidence of what happened. US marines and Army personnel were used for some of these operations. Drug trafficking provides the funds for many US political campaigns such as that of Bill Clinton when he ran for the Presidency. It also provides the funds necessary to carry out covert operations which are not approved by Congress.