My comments (marked "IMHO" ) were purely based on personal experience up to Mid Decemebr 2007, across Princess, P&O, Cunard & Fred.Olsen - some 50+ cruises in European waters & yet to have a bottle confiscated - long may that last.
If others have had different experiences then I guess it's down to luck - good or bad.
Last: Cunard Queen Victoria January 2016
Next: Oceania Nautica Aug 2016
Then: P&O Oceana December 2016
Golden, Grand(2), Caribbean, Royal, Sea(4+1 aborted)
Adonia(4+2), Arcadia, Artemis(2), Aurora(5), Azura(2), Britannia, Oceana(3), Oriana(12), Ventura(2), Victoria(5)
QM2(2), QE2(9), QV(7), QE, Caronia(2), Minerva, Minerva II, Fred.Olsen(8), NCL Jade, =X= Eclipse, HAL Ryndam, Aza.Journey