You can simplify it like this:
1: 2: 3: 4: 5:
SELECT * FROM dbo.vFurnaceDefects WHERE @ProdLine in ('fs', 'hv', 'tb') AND (dbo.vFurnaceDefects.[Effective Date] BETWEEN CONVERT(DATETIME, @EffectiveDate, 102) AND CONVERT(DATETIME, @EffectiveDate, 102));