Rumrunners are basically a plastic container that is not detectable by the x-ray machine, the chances of finding one is purely down to luck or having a 'suspect' object in your case.
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So in short, no they can't detect alcohol, but they can detect any liquid – and they're pretty vigilant about checking what that liquid is. Because whether it's alcohol or something more sinister that could be used to create an explosive, they'll want to know!
In addition to standard lifesaving equipment such as defibrillators and external pacemakers, our medical centers carry some of the latest in medical technology including thrombolytic therapy, electrocardiograph machines, lab equipment, pulse oximetry and x-ray machines on many of our ships.
Are Vapes Allowed on Cruise Ships? As mentioned, vapes are primarily treated similarly to cigarettes, and cruise ships are no exception. Therefore, you can generally bring a vape on a cruise ship.
However, the TSA does not allow alcohol with alcohol content higher than 70% (140 proof) in checked baggage. An individual may carry up to five liters of alcohol of between 24% and 70% alcohol volume in their checked luggage as long as it is in sealable bottles or flasks.
If cruise ship crew suspect you are sneaking alcohol on board they will inspect your luggage in detail. They may check your wine bottles to see if it really is sealed as new and contains wine. They will confiscate it if found to contain spirits, and may even refuse you boarding.
Usually, regular x-ray scanners are not ideal for liquid threat detection, but CT technology can do it better. Many airports use CT based explosive detection system to screen hold luggages, in which liquids may be contained.