procedure for interval time between two evidential breathalyser breath samples

[snowwalker]

Can anyone advise me if there is laid down procedure stating the minimum and maximum times between the two evidential breath tests that police must follow when breathalysing please?

 

[SeanJoyceStephensons]

The printout from the machine at the station will provide all times in GMT but there is not to my knowledge an exact time to be adhered to by the operator. The procedure is the most difficult part for the police to get right and often allows legal teams to obtain a not guilty acquittal. Cheers