Letter: High and drive

Sir: Jackie Flaherty (letter, 13 October) asks whether cannabis impairs the ability to drive. Reports from the USA and the Netherlands suggest there is little to worry about. A report by the Washington Department of Motor Vehicles has stated: "Simulated driving scores for subjects experiencing a normal social `high' and the same subjects under control conditions are not significantly different. However, there are significantly more errors for alcohol-intoxicated than for control subjects."

ALUN BUFFRY

Norwich