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 Cruise: Queen Victoria November 2014
Next: P&O Britannia March 2015
Then: Minerva April 2015
and : Royal Princess August 2015
Golden, Grand(2), Caribbean, Sea(4+1 aborted)
Adonia(4+2), Arcadia, Artemis(2), Aurora(5), Azura(2), Oceana(3), Oriana(11), Ventura(2), Victoria(5)
QM2(2), QE2(9), QV(6), QE, Caronia(2), Minerva II, Fred.Olsen(8), NCL Jade, =X= Eclipse, HAL Ryndam, Aza.Journey