By Nathan Hale Law360, Miami, FL (September 21, 2015, 9:01 PM ET) — Electronic Transaction Consultants Corp. won entry of a potentially key piece of evidence and outlined upward of $58 million the Miami-Dade County Expressway Authority allegedly owes ETC for work on the county’s cashless toll system, before resting its case Monday in Florida court. Texas-based ETC convinced Miami-Dade…