According to reports, several Biden administration staffers were suspended or asked to resign for marijuana use. 

During the hiring process, candidates were asked to disclose their history of recreational marijuana use but informed it would be overlooked. However, that wasn't the case for a number of staffers. 

“There were one-on-one calls with individual affected staffers—rather, ex-staffer," said a White House staffer asked to resign. "Nothing was ever explained. ... The policies were never explained, the threshold for what was excusable and what was inexcusable was never explained."

TMZ reports that White House Director of Management and Administration Anne Filipic was behind the firings. 

After the news broke, White House press secretary Jen Psaki took to Twitter saying: "We announced a few weeks ago that the White House had worked with the security service to update the policies to ensure that past marijuana use wouldn’t automatically disqualify staff from serving in the White House [...] As a result, more people will serve who would not have in the past with the same level of recent drug use. The bottom line is this: of the hundreds of people hired, only five people who had started working at the White House are no longer employed as a result of this policy."

Source: thedailybeast.com