State law calls for drug conviction fines that are greater than or equal to the “street value” of any illegal substance seized by police.The Illinois Controlled Substances Act says judges should determine that value based on the evidence in each case.But an Ottawa-based appeals panel split over what should happen when prosecutors don’t supply evidence of the value and lower courts still impose the fine.The 3rd District Appellate Court majority justices ruled the situation was essentially a miscalculation …