In Califonia cause of the ST Andreys fault line where the PACIFIC PLATE and the NORTH AMERICAN PLATE slide pass each other.
Thus, my ballpark estimated cost (basically for the AT&T conference call, $50 witness fee, $150 process server's fee; $400 deposition transcript, $25 for copying costs, and about 10 hours of legal work amount to a grand estimated total of about $625 plus 10 hours of legal work.
that equals $ 37 if you are called to testify in a federal lawsuit then the witness fee is higher under 28 usc 1821 you are entitled to a witness fee of $ 40 per day of attendance plus travel costs