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Five students from a public school in Pacajus, Ceará, created the Drug Test Pen, a pen that changes color and detects benzodiazepines in drinks in about 10 seconds. For only R$ 10, the invention promises to catch the “good night Cinderella” scam and has already been a finalist at Febrace.
Two numbers put this Brazilian invention on the path to the impossible: R$ 10 and 10 seconds. It is for this very low cost and in this lightning-fast time that a pen created by students from the interior of Ceará can indicate if a drink has been adulterated with substances used in the “good night Cinderella” scam. The solution is simple, cheap, and ingenious, exactly the combination that usually turns a science fair project into national news.
According to the Diário do Nordeste, the device is called Drug Test Pen and was developed by five students from Pacajus. The pen identifies the presence of benzodiazepines, the class of drugs most associated with the “good night Cinderella” scam, and does this so affordably that it can be produced for a fraction of the price of imported tests.
The pen that costs R$ 10 and acts in 10 seconds
While laboratory solutions and imported products for the same purpose can reach R$ 300, the pen from the students of Pacajus can be manufactured for about R$ 10. This price difference is not a detail, but the heart of the project, because a test only truly protects when it is cheap enough to fit in anyone’s pocket and purse.
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The speed completes the package and makes its use viable in the real world. In about 10 seconds, the pen delivers a visible response about the drink, a short enough time to be done at a bar table or at a party without much fuss. Together, the two brands, the price of R$ 10 and the response in 10 seconds, explain why the Drug Test Pen became a celebrated case of innovation made by young people within a public school.
Who created the Drug Test Pen
Behind the invention are five students from the José Maria Falcão State Professional Education School, in Pacajus, Ceará. The students, in their third year of high school, turned a concrete safety concern into an applied science project. The choice of theme already reveals maturity: instead of an abstract experiment, they targeted a real and everyday problem, proposing a practical tool to tackle the “good night Cinderella” scam.
The fact that the Drug Test Pen was born in a public school in the interior of Ceará reinforces the value of the achievement. It is quality science produced by students who identified a need and built a technological response to it. More than a school project, the pen is proof that talent and good ideas can emerge anywhere, and that the scientific curiosity of the students from Pacajus yielded an elegant solution to a complex problem.
How the pen works: the color-changing reaction
The principle behind the Drug Test Pen is chemistry, more specifically a colorimetric reaction. The use is straightforward: the person draws a line with the pen on filter paper or a napkin and then drops a few drops of the suspicious drink on the mark. If the drink contains the target compounds, the reaction causes dark spots to appear on the paper, a clear visual signal that benzodiazepines, the type of substance used in the scam, are present.
This approach is intelligent because it transforms a complex chemical test into something anyone can interpret. No laboratory equipment or training is needed: just observe if the color changes and black spots appear. By translating the detection of benzodiazepines into a simple visible effect, the pen puts an immediate reading response in the user’s hands, without intermediaries and without waiting.
R$ 10 versus R$ 300: the economy that makes the difference
The price comparison is the strongest argument in favor of the Drug Test Pen. Products and tests capable of identifying adulteration in drinks exist, but they tend to be expensive and not very accessible, with imported versions reaching R$ 300. When the same objective is achieved by a R$ 10 pen, the technology ceases to be a restricted luxury and has the potential to reach many more people, which is precisely where the social impact of the project lies.
This radical cost reduction is the type of innovation that matters in practice, not just on paper. A technically perfect solution is useless if its price makes it unfeasible for the audience that could most benefit from it. By reducing the cost from hundreds of reais to just a dozen, the students from Pacajus tackled the most concrete barrier of any protective tool against the “good night, Cinderella” scam: access.
What is the “good night, Cinderella” scam
The so-called “good night, Cinderella” scam is the popular name for a crime where someone secretly places a sedative substance in another person’s drink, with the aim of making them drowsy or unconscious to then commit some type of crime. Benzodiazepines, a class of calming medications, are among the substances most used in this type of scam, precisely because they act quickly and can go unnoticed in a drink.
It was with people’s safety in social environments in mind that the students designed the Drug Test Pen. The proposal is to give someone at a bar, party, or club a quick way to check their own drink before consuming it. Instead of relying solely on trust or luck, the pen offers an objective check, giving people back some control in the face of a risk that, until then, was almost impossible to verify at the moment.
From public school to Febrace
The project’s recognition came quickly and at a high level. The Drug Test Pen secured the students from Pacajus a spot among the finalists of the 23rd Brazilian Science and Engineering Fair, Febrace, one of the largest scientific events for young people in the country, held in São Paulo, at the University of São Paulo. Reaching Febrace is, in itself, a milestone, as it places a public school project from the interior of Ceará side by side with the best student works from all over Brazil.
This type of showcase matters far beyond the trophy. Fairs like Febrace give visibility to promising inventions, bring students closer to universities and companies, and can open doors for an idea to come off the paper and reach the world. For the students’ pen from Pacajus, Febrace acted as a springboard, transforming a local project to combat the “good night, Cinderella” scam into a story of innovation known throughout the country.
What the case of the pen that detects “good night, Cinderella” shows
The story of the Drug Test Pen is inspiring for what it represents: ingenuity, low cost, and focus on a real problem. It shows that five students from a public school in Pacajus were able to create a pen costing R$ 10 that detects benzodiazepines in seconds, an applied science feat that many well-funded laboratories would take time to match in simplicity. Still, it’s worth keeping grounded, because it is a promising student project, not a commercial product already tested and certified on a large scale, a stage that requires rigorous scientific validation before hitting the shelves.
It is fair, therefore, to separate merit from exaggeration. The pen detects benzodiazepines, which are among the most common substances in the “good night Cinderella” scam, but that doesn’t mean it covers all possible drugs or replaces attention and care in public environments. Still, few cases summarize so well the power of a good cheap idea: it took R$ 10, 10 seconds, and the creativity of five students from Pacajus to put a concrete tool in people’s hands against one of the most feared scams in the country.
And you, would you carry in your pocket a R$ 10 pen capable of warning, in seconds, if your drink was tampered with? Comment here if you think inventions like the Drug Test Pen, created by students from Pacajus, should receive more support to become a real product.
