Dr. Terry Stoops, John Locke Foundation director of education studies, explains why the new Watauga County high school — the most expensive in North Carolina history — should raise red flags for county voters considering an Aug. 31, 2010, referendum on a local sales-tax hike. Stoops’ comments are tied to the new report Boone-Doggle: Watauga County’s proposed $1.9 million tax increase.