(snip) His undercover work for the FBI over the last five years helped bust a string of public officials across Waller County who previously had evaded other probes, authorities said. To date, a mayor, justice of the peace, public works director and two aldermen have pleaded guilty to conspiring to defraud taxpayers by soliciting kickbacks. Many believe more heads will roll as investigators try to end an apparent systemic culture of corruption that had infected this rural county west of Houston. "Now I just want my life back," said Johnson, 47, who said he's lost nearly everything since taking his...