Wednesday, April 4th, 2012 — A Brazilian federal prosecutor on Tuesday launched his second 20 billion real ($10.9 billion) lawsuit against U.S. oil company Chevron and driller Transocean, doubling the stakes against the companies as critics call him as overzealous. The new lawsuit, the prosecutor’s second civil case against the companies in less than five months, is related to an oil leak discovered on March 4 in Chevron’s offshore Frade field northeast of Rio de Janeiro, the Federal Public Prosecutor’s office said in an email.