Viral social media posts are warning people to watch out for ice sinking in drinks as a sign they may have been spiked. This isn’t a reliable way to spot if a drink’s been tampered with though. In most cases, ice will continue to float in a spiked drink.
A number of posts seen by Full Fact use similar wording, which says: “With it being summer and more people are out drinking please remember when drinking if the ice in your drink isn’t floating, there’s something in your drink, as in drugs so make sure to check your drinks and your friends drinks [sic].This is missing important context, because looking out for sinking ice isn’t a reliable way to spot if a drink has been spiked.
Spiking a drink involves adding either alcohol or drugs to it without the drinker’s knowledge or consent. Although a drink with a very high concentration of ethanol may cause ice to sink, experts say that in most drink spiking cases ice will continue to float., a non-profit organisation focused on drug safety, told Full Fact that it was implausible that the relatively small quantities of drugs or alcohol usually added to a spiked drink could cause ice to sink.
He said: “Ice floats in water because it has a lower density. For ice to sink, it needs to have a higher density than what it's floating in, but the addition of a small amount of powder to a drink will not make a meaningful change to the density, so it won't change the ability of ice to float whatsoever.
“The only plausible thing that could be used for this would be ethanol , which is less dense than ice. But accounting for air bubbles in the ice and other factors, the drink would need to be at least 50% ethanol before ice would start sinking.”
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