Human Factor
No slanging match will ensue, but you really must read the latest law on this. Its based, quite rightly, on the alcohol in your blood at the time of flying.
You are no longer able to go to those late night parties, banging back the G&Ts, in the knowledge that you will be legal 8 hours later, irrespective of how pissed you still are.
The quirk of this law, which what I was trying to point out in a reasoned manner, is that you can have a glass of wine or half a pint of beer with lunch and then fly that evening. Some/most/all/none may choose not to, but your flight will be legal as your body will have broken down the alcohol many hours ahead of your flight.
Read the Act. As a commercial pilot, your job may well depend on it.