On January 20, 2017 — the same day as the presidential inauguration — one DC-based group handed out thousands of hand-rolled joints for free. Recreational cannabis use is legal in Washington D.C. DCMJ With the inauguration of Donald Trump on January 20, the United States got a new president. And with that new president comes a long list of new appointees across various federal agencies and departments. While President Trump's cabinet selection process has played out publicly, a variety of folks from former president Barack Obama's administration have quietly stayed on.

One of the most prominent people that's staying on is the head of the Drug Enforcement Agency, Chuck Rosenberg, who was appointed by former attorney general Loretta Lynch in May 2015.

And that's particularly notable, as the DEA is responsible for enforcing drug policy in the United States. Most importantly for most Americans, Rosenberg is in charge of enforcing marijuana illegality in the US — an area where, traditionally, the federal government and individual US states have butted heads.

For instance, California legalized medical marijuana use in 1996; despite legality in California, the drug remained illegal on a federal level, and the US government — through the DEA — policed it as such. California medical dispensaries were raided by the federal government repeatedly, regardless of its legality in the eyes of the State of California.

That relationship dramatically changed in 2013 due to a document known as "The Cole Memo" (written by deputy attorney general James Cole). The document re-focused federal resources away from prosecuting individuals who were operating legally within their own states, and instead focused on containment and prevention.

In so many words, it directed federal agencies to stop clashing with state-level marijuana policy.

And DEA head Chuck Rosenberg has upheld that memo.

DEA administrator Chuck Rosenberg in February 2016. AP/Alex Brandon

"He didn't have too much of a problem following the administration's directives on that issue," Marijuana Policy Project senior communications manager Morgan Fox told Business Insider. "And it says a lot for continuity — things will remain relatively the same at the DEA."

Of course, this is all up for change. If Trump's attorney general appointee, Senator Jeff Sessions, is appointed, he could direct the DEA to take a more hardline stance. And if President Trump himself decides to take a more hardline stance, that would also impact how the DEA operates when it comes to federal marijuana policy. To be clear, neither Sessions nor Trump have indicated as much.

As Fox told Business Insider, "The DEA head acts as the direction of the attorney general who acts at the direction of the president." That said, both President Trump and Senator Sessions have indicated intentions to keep the status quo: allowing states to legislate and police their own drug laws.

In 2016, alongside Trump winning the presidency, several states enacted laws either outright legalizing recreational marijuana use, cultivation, and distribution/sales or legalized medical use. For the foreseeable future, it looks like the US government will continue to defer to individual states in terms of marijuana policy.