A traverse juror is a trial juror, meaning he or she will try an action or a prosecution. A traverse or trial juror is not the same as someone who sits on a grand jury.
A potential juror is interviewed by the trial lawyers to determine his or her suitability to serve as a juror for an upcoming case. Lawyers want to confirm that all jurors are free of bias on the topic or topics related to the case. Different states have different rules for jury duty. Some will allow people to serve one day and if they are not chosen for a jury, they are released from duty while others may make a potential juror report every day for a set time period.