“It is important to understand that it is only the already disadvantaged category of witnesses … who must answer questions about their understanding of
the duty to tell the truth,” added LEAF legal director Joanna Birenbaum. “No other category of witness is required to do so. Not even convicted perjurers
are probed before taking the stand on whether they feel bound to tell the truth.”

Read more at
http://www.accessibilitynewsinternational.com/?p=2150