in on the potential use of mdma, better known as ecstasy as a treatment for ptsd. some studies have found that it helped when combined with talk therapy, but the panel overwhelmingly concluded the data shows it is not effective in patients with ptsd. now to our nbc news exclusive. the ceo of america's biggest car company, gm, still betting big on electric vehicles, despite a slowdown in ev sales and criticism from former president trump. she spoke with tom costello. >> reporter: rolling off the assembly line, two new electric vehicles on which general motors is betting big. an ev version of its best-selling silverado and the equinox suv. >> we're executing. we're launching. >> reporter: despite a slowdown in ev sales across all brands, ceo mary barra says gm is all in on all electric. >> we're committed to this technology, getting it right, and offering the consumer something that is going to make their life better. >> reporter: all right.