Per MSNBC 7/27
It involved all 3: Shuttle, T-38's & Soyuz. The report also said that alcohol is allowed in crew quarters during quarantine but intimated that that is no longer true as of 7/27.
MSNBC included a comment from Laurel Clark's husband about being surprised that alcohol is allowed during quarantine. I'm not sure why they felt they needed to include that.
MSNBC
