Bengaluru, Jan. 30 -- Less than five weeks before the US trial of a six-year-old case begins to determine whether two former executives of Cognizant Technology Solutions Corp. (CTS) routed illicit payments through Larsen and Toubro Ltd to unnamed Indian government officials, it is unclear if an ex-Cognizant executive, the US government's "essential witness" will travel to testify when the case starts on March 3....