Definition - What does Swift Witness mean?
A swift witness is a witness who appears to be extremely biased and who shows strong support for the party who called him or her to testify.
Swift witnesses typically show enthusiasm and a determination to testify in favor of their calling parties. Swift witnesses are also known as zealous witnesses.
Justipedia explains Swift Witness
Swift witnesses can present a potential problem for the court because strong biases can lead to testimonies that are not completely accurate. However, lawyers often have the opportunity to cross-examine witnesses. So, if a lawyer senses that a witness is a swift witness, he or she can try to emphasize that bias during a cross-examination.
Swift witnesses often have good reason to be biased. This could be because they know the party, or are partial to his or her cause, etc.