Johnson & Johnson “rigged the tests” to avoid conceding that its baby powder contained asbestos, causing 22 women to get ovarian cancer, plaintiffs lawyer Mark Lanier told a St. Louis jury in opening statements on Wednesday in the most high-volume talcum powder trial to date.

The trial, which is expected to last until mid-July, comes in a case that’s one of thousands filed by women and their families claiming they got ovarian cancer after prolonged use of Johnson & Johnson’s talcum powder products. While some of the prior trials hinted at asbestos in cosmetic talc, Lanier, in his first talc trial against Johnson & Johnson, showered the jury with the science behind the mineral. The National Law Journal monitored the proceedings through online streaming of the trial by Courtroom View Network.