Guardia Civil says this hidden wallet item could leave you with a €30,000 fine

Most people would probably not think twice about carrying it. It fits inside a wallet, looks almost identical to a normal bank card and can easily pass unnoticed mixed in with loyalty cards or ID. But according to Spain’s Guardia Civil, this small object can actually be treated as a prohibited weapon and carrying one could end up costing thousands of euros in fines.  See video below

The warning appeared after officers shared a video online showing a so called ‘credit card knife’ recently seized during police operations. Closed flat, it looks harmless. Open it though, and the card folds into a small stainless steel knife hidden inside the plastic structure.

Spanish authorities say that is exactly what makes it dangerous.Because unlike a normal knife, this one is specifically designed to stay unnoticed until the blade is unfolded.

The Guardia Civil says objects like these can fall under Spain’s prohibited weapons laws, with possible fines ranging anywhere from €600 to €30,000 depending on the case.And judging by the reaction online, plenty of people had absolutely no idea.

At first glance it just looks like an ordinary card

That is really the part catching people’s attention.The object does not look remotely threatening when folded flat. It is roughly the same size as a debit card, thin enough to slide inside a wallet and easy to mistake for some kind of multitool gadget.

Then it opens. Within a few seconds, the plastic sections fold back and a small blade appears in the middle. According to the Guardia Civil, the knife measures around five centimetres once assembled.

The video posted by officers spread quickly on TikTok because many users admitted they had seen similar products sold online before, often advertised as camping tools, survival accessories or novelty gadgets.

Some even said they had considered buying one themselves.That is part of the issue authorities are trying to highlight. A product being sold openly online does not necessarily mean it is legal to carry around in Spain.

Police say concealed blades or disguised weapons are treated very differently from ordinary everyday objects because their whole purpose is to avoid detection.

And Spanish law tends to be fairly strict on that point.

@guardiacivil ❌ No puedes llevar esta “tarjeta” en tu cartera. Es un arma prohibida ⛔️ al ser especialmente peligrosa. No puede usarse como autodefensa y llevarlo te puede costar hasta 30.000€ ‼️ #guardiacivil #seguridad ♬ sonido original – Guardia Civil

The online reaction quickly turned into a debate about self defence

Like a lot of Guardia Civil posts lately, the comments section became almost as big as the warning itself.

Some people criticised the restrictions immediately, arguing that ordinary citizens should be allowed to carry something for protection. Others complained that Spain bans too many self defence items while criminals ignore the rules anyway.

One person wrote that “everything is prohibited” in Spain. Another said they would rather pay a fine than feel unsafe walking home alone at night.

Several users also started asking what people are actually allowed to carry legally.

Can you carry pepper spray? What about tactical pens? Small alarms? Keychain tools?

That confusion comes up constantly because Spanish weapons laws can feel surprisingly strict compared with what some foreigners are used to elsewhere.

A lot of people assume that if an object is sold publicly on the internet, carrying it must automatically be legal too. But police repeatedly warn that the two things are not the same.

Something can be legal to buy online and still create serious problems if officers find it during a police check or airport screening.

Police say hidden weapons are becoming more common

The credit card knife is far from the first disguised weapon authorities have encountered.

Over the years, police across Europe have confiscated blades hidden inside pens, combs, walking sticks, keyrings and belt buckles. But officers say smaller concealed designs are becoming increasingly common because they are easier to carry unnoticed.

And that is exactly what worries security forces.A knife clipped visibly onto someone’s belt attracts attention immediately. A fake bank card hidden inside a wallet usually does not.

That becomes especially sensitive in places like airports, concerts or public buildings where concealed blades can create obvious security concerns.

Some travellers only discover these objects are prohibited when airport security pulls them aside during bag checks. Others genuinely seem unaware the item qualifies as a weapon under Spanish law.

The Guardia Civil says these kinds of objects continue being seized regularly during operations and inspections across the country.

For most people, the story probably feels strange because the object itself looks so ordinary.

That is really the whole point. It is not designed to look like a knife. And according to Spanish authorities, that is exactly why carrying one can become such a serious problem.