All in a days work

When an accident occurs, it is Fred's job to try and work out what made it happen. The police report and his collection of toy cars come in handy for re-enactments. However, sometimes, simple toys are not enough. In that case, he then has to then visit the site of the accident and use real vehicles. Once he suspects the cause, Fred uses mathematics and physics to figure out what actually happened. Despite this, he says “nothing is a fact until the court decides it is”. Sometimes Fred has to testify in court as a witness.