Dr. Logan Clark
The job of a witness
As the school consoler, Dr. Logan Clark could be asked to give information about Jordan Miller that may lead the jury to believe his innocence. When questioned by the prosecution, Clark will likely have to navigate a series of questions designed to incriminate the defense based on suspicious behavior reported of Miller.
Significance of a witness
Dr. Clark will be the only one in the court room who has a both superior and personal relationship with both the defendant and the offense. Clark will be responsible for giving the jury an impression of Miller's possible motivation for committing the crime.
power of persuasion
If Clark gives a very strong willed impression of Miller, saturated with glowing rhetoric, it may bring the jury to sympathize and cut him some slack. However, if Clark seems indifferent, they jury may be more moved by the prosecution's stance.