State Trooper Anthony Borostowski was driving 122 miles-an-hour on a rainy freeway just before a crash that killed him near Wisconsin Dells. A Sauk County sheriff’s sergeant has completed an analysis of the April eleventh mishap on Interstate 90/94 — and it says the 34-year-old Borostowski of Tomah left no margin for error while driving on a surface with reduced friction. Reports said the officer lost control of his squad car and hit a tree, but it was not known what prompted that. Earlier reports said he was parked in a median just moments before the mishap, indicating that he was trying to catch up with an offending motorist. The sheriff’s analysis showed there were no mechanical issues with the patrol car, and Borostowski — who served three tours of duty in the Middle East with the National Guard — had only caffeine in his system.