 Terahertz systems facilitate the detection of metallic and nonmetallic contamination in food.For example, terahertz waves made it possible to detect metallic and nonmetallic foreign matter in chocolate bars, since food with low water contents, such as chocolates, are almost transparent in the terahertz band.Terahertz tomography is also useful in the wine and spirits industries for quantifying moisture and analysing cork non-destructively.