Embattled Chevron Executive Richard Reis Veiga, already under investigation in Ecuador on fraud charges over his role in a botched environmental clean-up, is scheduled to be put under oath today by Ecuador’s government as part of a multi-billon dollar civil case in U.S. federal court to determine who pays for what experts believe is the world’s worst oil-related contamination.... The deposition of Reis Veiga, a Chevron Vice President, comes at an inopportune time for the company. Already, Ecuador’s lead national prosecutor is investigating Chevron on possible fraud charges while in the U.S. the Securities and Exchange Commission is probing whether the company violated regulations by failing to disclose [Chevron's] liability [over its Ecuador contamination]– estimated at $6 billion -- to shareholders.