The official border between Illinois and Kentucky is the low-water mark on the north side of the Ohio River as it existed in 1792, when the Bluegrass State gained statehood.But police in the two states had agreed on a different legal landscape, one that gave Kentucky officers the right to gather evidence on a crash that technically occurred in Illinois, according to an appeals panel.The 5th District Appellate Court has reversed the suppression of DUI evidence collected by Kentucky sheriff’s deputies after an incident …