Ending Team USA’s 10-year medal drought at the weightlifting world championships could depend largely on Sarah Robles, the team’s 27-year-old star.

But executing a nearly 350-pound clean and jerk at this week’s world championships in Houston isn’t the only test facing her. “Is she clean?” asks Dennis Snethen, a veteran weightlifting coach and former president of USA Weightlifting, the sport’s governing body.

It isn’t just that Robles tested positive two years ago for an anabolic steroid and/or its metabolites. It’s that her two-year suspension ended only in August, meaning she didn’t participate in the drug-tested meets that served as qualifiers for this month’s worlds. In a controversial move, USA Weightlifting recently voted her onto the team, essentially displacing two less-accomplished athletes who believed they had qualified for the championships.

“What USA Weightlifting did is morally wrong, it’s unethical,” says Caitlin Hogan, a CrossFit star-turned-weightlifter whose coach filed a grievance with USA Weightlifting and the U.S. Olympic Committee, arguing that Hogan’s spot on the team was wrongly given to Robles.

Robles vows to vindicate—in the drug-testing lab and on the mat—U.S. Weightlifting’s decision to place her on the team. “I’m clean,” Robles said, saying that she participated in out-of-competition drug testing throughout her suspension. Looking ahead to her competition next week, she said: “Third place is attainable for me. Second or higher, I’m not so sure.”