elizabeth holmes was on the stand for a second day receiving in her own high-profile fraud trial. kristen dahlgren is following it. reporter: today the jury hearing from theranos founder, elizabeth holmes in her own words, fighting back by telling jurors she thought her blood testing device was a really big idea and describing clinical results as excellent holmes pleaded not guilty to charges she defrauded investors by lying about theranos technology saying it could run range of tests on a few drops of blood. we d like to see a world in which every person gets access to this type of basic testing. reporter: the company once valued at $9 billion put holmes on the cover of magazines backed by big names like the walton family and rupert murdoch but the prosecution has tried to paint a picture of a con woman who knew the device didn t work. defense documents indicate they will argue holmes former partner and boyfriend was pulling the
strings. in spite of holmes once saying the buck stopped with her anything that happens in this company is my responsibility at the end of the day. reporter: but one lawyer said he adamantly denies wrongdoing elizabeth holmes has a long history of charming knowledgeable, influential people so it stands to reason that her attorneys think she can also charm 12 jurors sitting in front of her. reporter: holmes testimony is expected to continue tomorrow when the prosecution may get a chance to question the woman who hopes she is her own best witness kristen dahlgren, nbc news. we have more to tell you about up next, getting the items you want this holiday season our exclusive interview with walmart s ceo. could their advantage leave small businesses with empty shelves