I feel the need to clarify a few things regarding the Norwegian law on this.
1. You are not allowed to have a blood concentration higher than 0.02% at the start of your flight duty period (planning stage).
2. You are not allowed to consume alcohol for a period of 8 hours prior to a flight duty period.
3. There is no such rule that you must be under the legal limit 8 hours prior to a flight duty period!
4. Most Norwegian operators impose their own stricter policy of no consumption the last 12 hours prior to flight duty. This is only for internal diciplining (most likely sacking), but not of any concern regarding punishment by law.
5. It is only if you know you have messed up, and should understand that it will lead to an investigation of some sort, that you shall not drink any alcohol for 6 hours after the incident. This also applies for driving cars. There was a case last year about a helicopter pilot who crashed, and who was drunk when the authorities arrived. He claimed he had been so shook up and disturbed by the incident that he had concumed large amounts of alcohol afterwards. He, I believe, was actually aquitted and released by the court of appeal, after an initial sentencing earlier.
Norway is also notorious for holding people on remand awaiting trial, and they have several times been reported by human rights organizations to the ECHR in Strasbourg for the practice.