If the person in question has not gone airside with the intention of flying an aircraft then they haven't committed a crime, no matter how much alcohol they've consumed. You could call the police if you want but they'd simply scratch their heads for a while, look for something to charge them with, then release them. If the person in question had consumed sufficient alcohol that you'd be able to notice then you'd have challenged them long before they went airside. People don't just turn up drunk on an aircraft, reeking of alcohol. Scratch the surface and you'll often find many of these breathalyser tests are triggered by a 'tip off' from an individual with malicious intent.