HC Deb 20 March 1969 vol 780 c721
18. Sir J. Langford-Holt

asked the Secretary of State for the Home Department what arrangements are made to achieve standard reading of breathalyser tests under different coloured artificial lights at night.

Mr. Elystan Morgan

My right hon. Friend has advised the police that in some conditions of artificial lighting the breath-testing device should be read by the light of a torch, an interior car light or the light of a headlamp.