[wrs]

Juries are supposed to apply “common sense” as well as evaluate the veracity of testimony. If expert domain knowledge is necessary, expert witnesses will be called to present it. Experts on a jury are a problem because they will essentially provide alternate evidence outside the public court procedure (jury proceedings are secret), and because their expertise is not subject to challenge by the other side. (Imagine the Dunning-Kruger effect in a jury setting.)