Chuangxing RDTD19H, a benchtop (portable) drug detection device based on fluorescent immunoassay technology, rapidly generates quantitative results for illicit drug concentrations in samples (including hair, fabric, paper, plant material, swabs, blood, urine, saliva, and water samples). It detects dozens of substances including morphine, methamphetamine, ketamine, etomidate, dextromethorphan, cannabis, cocaine, and ecstasy. It comes standard with a hair grinding device and a constant-temperature incubator, effectively eliminating interference from sample processing, temperature, and time on test results. Suitable for rapid on-site sample testing, its integrated, high-precision design enables it to play a critical role in various scenarios, including preliminary laboratory screening and evidence collection at law enforcement sites.
Chuangxing Hair Drug Detector features simple operation, portability and easy sampling. It adopts non-invasive hair testing with no risk of bacterial infection and adapts to various testing environments. The entire testing process takes no more than 10 minutes, greatly improving the work efficiency of grassroots police officers. The instrument is characterized by high signal-to-noise ratio, high resolution, high wavelength accuracy and a full set of testing accessories.
Each Chuangxing Hair Drug Detector is a network-connected device that eliminates information silos. It supports real-time testing and uploads data including test subjects, testing items, results, conclusions and time to the big data platform for drug abuse detection on the public security intranet via wireless transmission from the device terminal. Public security organs at all levels can monitor the dynamic information of drug addicts in real time through the public security private network. All data from hair testing devices are uploaded automatically, ensuring data security and sharing.
II. Product Background With rapid globalization and social development, drug-related crimes in China show a rising trend of high incidence and abuse. Relevant national authorities attach great importance to scientific research on drug control, among which improving drug testing technology has become a key part.
To overcome the drawbacks of urine and saliva testing for drug addicts and abusers used by public security drug control police, and to accurately support, apply and meet the needs of frontline drug control operations, the Ministry of Public Security issued the Specifications for Hair Sample Testing of Drug-related Persons, which stipulates requirements for the collection, preservation, submission and testing of hair samples from drug-related individuals.
In accordance with these specifications, our company has developed the Chuangxing RDTD19H Hair Drug Detector. At present, the product has obtained the product inspection report issued by the Quality Inspection Center for Safety and Police Electronic Products of the Ministry of Public Security for its testing instrument, system and reagents. The hair drug testing system has obtained software copyright and software product certification. The product also holds a scientific and technological novelty search report issued by a provincial-level science and technology department.
III. Advantages of Hair Testing As a legally recognized biological testing sample, hair has incomparable advantages.
There are dense capillaries around hair follicles. Drugs or pharmaceuticals in the blood enter the scalp follicles during hair growth and are fixed by keratin in the hair. Hair containing drugs will grow out of the scalp surface in about 3–5 days. Hair grows at a relatively stable speed. Based on this mechanism, the type, duration and dosage of drug abuse can be estimated, which is the significance of trace testing.
Hair drug trace testing technology also has unique strengths:long detection window, comprehensive drug abuse information, sample resistance to corruption, easy collection, easy storage and repeatable sampling.
Among them, long detection window is the most prominent advantage. According to hair length, it can reflect drug use from several weeks to several months, with a maximum detectable history of 3–6 months. Combined with urine testing, it can comprehensively evaluate the drug abuse status of subjects and meet the needs of drug control and rehabilitation work.
IV. Technical Principle Time-Resolved Fluoroimmunoassay (TRFIA) is a special fluorescence analysis developed on the basis of Fluoroimmunoassay (FIA).
It uses lanthanide elements to label antigens or antibodies. Based on the luminescence properties of lanthanide chelates, fluorescence is measured by time-resolved technology, with wavelength and time as dual parameters for signal resolution, which effectively eliminates interference from non-specific fluorescence and greatly improves analytical sensitivity.
Fluorescence analysis overcomes the influence of stray light in conventional UV-Vis spectrophotometry by the large difference between fluorescence wavelength and excitation wavelength. Meanwhile, unlike conventional spectrophotometry, the photoelectric receiver is not aligned with the excitation light, so excitation light cannot reach the receiver directly, greatly improving optical sensitivity.
However, for ultra-micro analysis, the influence of stray light from excitation light becomes severe and becomes the bottleneck for sensitivity improvement.
The ideal solution is to perform measurement without excitation light. Conventional fluorescent labels have extremely short fluorescence lifetimes — fluorescence disappears as soon as excitation light stops. However, a small number of rare earth metals (Eu, Tb, Sm, Dy) have long fluorescence lifetimes of 1–2 ms, meeting measurement requirements. This led to the creation of Time-Resolved Fluoroimmunoassay: an analytical method that uses long-acting fluorescent markers and measures fluorescence intensity after the excitation light is turned off.
The Hair Drug Detector precisely applies Time-Resolved Fluoroimmunoassay to quickly detect illicit drugs based on fluorescence emission beams. With high signal-to-noise ratio, high resolution, high wavelength accuracy and complete testing accessories, it can easily meet the requirements for qualitative and quantitative analysis and scientific research of illicit drugs within 5 minutes.
六. Product Features and Advantages ● Advanced Technology: Time-resolved fluorescence technology is an emerging and highly accurate rapid immunoassay method.
● Rapid Detection: Quantitative detection of drug content in hair samples from suspected individuals can be completed within 10 minutes.
● High Sensitivity: Sensitivity reaches the nanogram level, and the minimum detection limit complies with the provisions of Gong Jin Du [2018] No. 938.
● Easy Sampling: Only a small amount of hair (5 mg) is required, no privacy issues, and avoids adulteration or substitution.
● Convenient Storage: Hair samples can be stored at room temperature, while urine, blood and other samples usually require cryogenic freezing.
● Long Detection Window: Hair can be used to detect drug use in suspected individuals up to 3–6 months back.
● Stable Environment: A constant-temperature incubator effectively eliminates interference from time and low room temperature on the reaction.
● Accurate Quantitation: Precise sampling and standardized experimental procedures ensure highly reliable quantitative test results.
● Simple Operation: Operators can perform accurate tests after only basic training.
● Complete Product Line: Includes benchtop models, handheld models, and multi-panel card readers.
● Full Certifications: The instrument, testing system and supporting reagents all have test reports issued by the Ministry of Public Security.
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