Theranos founder Elizabeth Holmes headed to court Tuesday, as her legal team sought to help assemble a group of impartial jurors to weigh the criminal-fraud charges filed against her, a task her lawyers say is challenging, given her case's notoriety.

Holmes's legal team and prosecutors with the US attorney's office for the Northern District of California have been scrutinizing a pool of nearly 200 potential jurors to find the 17 needed to serve on the four-month-long trial.