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A few years ago, I worked in nightclub security. During my training course,* the instructor told us that it was common for people to come up and claim that they had been spiked with something, but that in 92%† of cases it was just excessive alcohol intoxication.‡

In my experience, a lot of people who believe they have been spiked do not end up in hospital, but some do. Presumably, those who do are screened for drugs (particularly if they wish to press charges), so surely somewhere out there is data showing how many of those screenings come up positive.§

So, my question: What proportion of suspected drug spikings turn out to be just that, rather than overintoxication of alcohol or something else?

Everything I can find on this seems to a) focus on the prevalence of spiking generally and b) relies on self-reporting rather than later toxicology results. For example, this 2016 paper made some waves by claiming that 1 in 13 of its surveyed students reported having been spiked, but is all self-reported. Similarly for this report. Finally, this BBC article says there have been no convictions for spiking in the last five years, which could suggest that most alleged spikings do not show up as such on subsequent tests,| but could also be for any number of other reasons.

*In the UK, security work requires professional training and a government license.

† It may have been higher, but certainly something in the 90s

‡ However, this could be both someone forgetting how much they'd drunk or a case of someone giving them more alcohol than they thought (e.g., double vodka cokes instead of singles), the latter of which would still be considered spiking.

§ Although, of course, it may be hard to tell whether traces of cocaine, to give one example, are the result of the casualty taking it themselves, or having a drink spiked with it, or possibly even both.

| And if someone is just spiked with alcohol, I imagine it would be near-impossible to be able to prosecute this.

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    One study: ncbi.nlm.nih.gov/pmc/articles/PMC2750925 – A E Dec 2 '19 at 20:57
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    Anecdotal, but I knew two people who made such claims in my junkie years. One was to his parents and the other to his employers. It's a common excuse. – Jerome Viveiros Dec 3 '19 at 5:47
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    @gerrit Spiking = the intentional addition of a drug to someone else's food or drink without their knowledge or consent. Yes, alcohol is a drug, but see ‡ in the question above. As stated in the question, I am asking about spiking with drugs other than alcohol. – Rumps Dec 3 '19 at 11:41
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    @JeromeViveiros True, although it's a bit different within the context above of people coming up to security claiming to have been spiked because they feel unusual, rather than claiming to have been spiked to excuse a positive drug test. The alleged spikee has chosen to make the contact in the former case. – Rumps Dec 3 '19 at 11:42
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    @AE Exactly the kind of methodology I was after, and a result (drugs of unexplained origin detected in 10% of participants, sedative drugs in only 3%) that broadly gels with the figure I quoted in the question - would you like to write this up as an answer so I can accept it? – Rumps Dec 5 '19 at 10:04

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