Most of you seem to have no clue about breathalysers. Because so many companies (many of them are my customers) test everybody entering their premises, I have actually taken the time to study the breathalyser.
What kind of breathalyser they used at the airport doesn't matter to me much, but the police would have tested him with a breathalyser that has an extremely accurate sensor called the Fuel Cell sensor. If their instrument was properly calibrated, the reading would have been extremely close to the blood sample they most likely took later on. A blood test is the most accurate reading you can get.
If the breathalyser at the police station showed 0.000, he would have walked out of the door and resumed work. Where I am, if you blow so much as 0.001 %BAC, you kiss your flying career goodbye, no police test required. It's a huge pity he didn't call in sick.