Why did Iga Swiatek get a one-month doping ban? What did she test positive for?

Iga Swiatek is the second high-profile tennis player to test positive for a banned substance this year, joining Jannik Sinner. While Sinner, currently the No. 1 ranked man, was fully cleared, Swiatek, who slid from No. 1 to No. 2 last month, accepted a one-month suspension that was announced Thursday. The International Tennis Integrity Agency said it determined that Swiatek's tainted urine sample was because of a contaminated medicine she took and so she bore a low level of responsibility.