The two teams were reportedly chosen at random, though the DEA checks were to determine how visiting teams in particular are handling substances across state lines, and to verify that the medical staff has the appropriate licenses for the state in which they are visiting. DEA spokesperson Rusty Payne said no arrests were made.
The medical staffs were part of travel parties whose teams were playing at stadiums across the country. The law enforcement official said DEA agents, working in cooperation with the Transportation Security Administration, inspected multiple teams but would not specify which ones were inspected or where.
According to the Washington Post, the investigation - which could be ongoing - is the result of the lawsuit from former players that claims team doctors gave them painkillers instead of appropriate medical attention.
Steve Silverman, an attorney in the aforementioned lawsuit, explained the significance of the investigations: "I trust the evidence reviewed and validated leading up to this action was substantial and compelling."