Reliability of device-Motorist failing two roadside breath tests-Reading on evidential breath machine at police station in excess of prescribed limit-Motorist challenging reliability of machine on grounds of evidence from expert and of his consumption of one drink four hours earlier-Whether burden on motorist to rebut presumption of machine's reliability on balance of probabilities-Whether judge entitled to reject motorist's evidence and convict-Road Traffic Offenders Act 1988 s.l 5.
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