Attorneys are to poll Dallas County residents about the case for a second day Friday.
Opening statements in the case are expected next week.
Brent is charged with intoxication manslaughter in the December 2012 death of Jerry Brown in a fatal crash. Police in the Dallas suburb of Irving say Brent was driving with a blood-alcohol level more than twice the legal limit.
If convicted of intoxication manslaughter or manslaughter, Brent could face 20 years in prison. He could also get probation.