Contactless bank cards setting off the security alarms in shops

17
Posted 27th Jun 2019
It started a few months ago where every now and again the alarm would go off when I entered and exited the store. Not every store and not every time. I definitely remember it happening in Asda, Lidl and B&Q.

After a while I realised it was the credit and debit cards in my wallet that were setting the alarms off.

I have quite a collection (mainly from unused credit card accounts where I have shifted the balance around) and it seems that if you stack enough contactless cards together the signal is strong enough to trigger the security alarm!

It first dawned on me what was happening as I was leaving B&Q one time. I tested it by taking out my wallet and holding it up to the barrier thing and sure enough the alarm triggered. I took out a bunch of cards and held them up one by one and nothing, no alarm. But when I grouped a bunch of them together that's when the alarm went off.

So there you go. Contactless bank cards are capable of setting off security alarms.

You may have already been aware of that but it was a revelation to me, and a relief because it did cause one or two awkward moments where I had to convince the security guard I wasn't a tea leaf!
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17 Comments
So after explaining that to them you got away with the bottles of Whiskey stashed under your coat ? .
It’s the magnetic strips not the contactless apparently. I spoke to a guard after numerous times of setting alarms off. I suggest putting you cards so the strips on the back are all in different places. Eg 1 upside down, 1 back to front. Worked for me
I call nonsense. If that would be the case million of people would have the same problem
This happened to me in Lidi twice and once in Tesco. Bought a RFID purse which blocks the signal to my cards
deleted90213927/06/2019 15:35

So after explaining that to them you got away with the …So after explaining that to them you got away with the bottles of Whiskey stashed under your coat ? .


They sell whisky at b&q now?
No wonder it's packed at weekends!
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deleted1471098
It’s not a problem if you have an RFID wallet which blocks it.
summerof7627/06/2019 16:49

This happened to me in Lidi twice and once in Tesco. Bought a RFID purse …This happened to me in Lidi twice and once in Tesco. Bought a RFID purse which blocks the signal to my cards


I had the same problem but an RFID proof wallet cured their problem.
summerof7627/06/2019 16:49

This happened to me in Lidi twice and once in Tesco. Bought a RFID purse …This happened to me in Lidi twice and once in Tesco. Bought a RFID purse which blocks the signal to my cards


Why so many credit cards? I thought you were wadded
Witnessed it happen to a woman entering House of Fraser she said the same thing about it being her contactless card, I thought she was full of BS ...... You live you learn
summerof7627/06/2019 16:49

This happened to me in Lidi twice and once in Tesco. Bought a RFID purse …This happened to me in Lidi twice and once in Tesco. Bought a RFID purse which blocks the signal to my cards



deleted8085827/06/2019 19:27

Why so many credit cards? I thought you were wadded



"Stacked" was the preferred term.
My library books trigger the alarms too
I had an old wallet that did this so occasionally held it above my head to stop it being detected
Why do people say "tea leaf'
Norseg28/06/2019 18:51

Why do people say "tea leaf'



Cockney rhyming slang for thief I think.
jaketheplumber28/06/2019 19:15

Cockney rhyming slang for thief I think.


Londoners are so weird they have to associate even robbers with tea

If I was a police officer and someone said "oi copper some bloody *anker tea leaf stole ma bike" I would laugh
Edited by: "Norseg" 28th Jun 2019
Great thread and comments
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