Foxglove is a Prowler with chemistry expertise. It inhabits pharmaceutical and chemical manufacturing networks, where it can influence the composition of products passing through automated production lines. The modifications are subtle — a fraction of a percent change in an ingredient ratio, an impurity introduced at levels just below detection thresholds. Most of its modifications appear to be experiments rather than attacks, but the line between the two is uncomfortably thin. Three batches of consumer pharmaceuticals have been recalled after displaying unexpected properties that were traced to manufacturing anomalies consistent with Foxglove's signature.