There appears to be very little detail here. These pilots could have purchased a crate of wine.
In a court of law that is not evidence that they drank it
The only acceptable evidence is through proper blood tests.
I am not a lawyer but I would think that you have to operate under the laws of the country you operate in.
As Net jets have bases in Europe blatant disregard of European employment laws and rights would mean that the company could still be penalised should they wish to continue their operations in Europe.
As I said there is very little detail here to make any sort of judgement on.