5.0 out of 5 stars Toxicologists thoughts

M. · October 6, 2017

I was a forensic toxicologist for 20 years and have had friends and coworker ask me about testing for THC over the past few years since it has been legalized in many states for recreational use (including my state). I handled R&D for SAMHSA/NIDA confirmatory testing by GC/MS, as well as initial screening by immunoassay using various instruments (Hitachi, Olympus, etc). Since these were FDA approved and to SAMHSA standards, they would more than likely perform as expected.In order to recommend quick test strip kits to people, I decided to try some kits. This product performed well in my testing. I used myself as a negative control and the expiration of the strips I received were in 2019. The result was correct with the THC patient line being the same density/color as the control.I then tested a known user at two stages. They were a light user so I tested 1 hour after use and the test was as expected, with a slight positive (faint line on the THC but less prominent than the control). At 1 hour I expected it to be either negative or slightly positive due to the cannabis metabolism rate (but it can vary depending on the individual). I also tested after about 8 hours and it was positive with no THC line and the control line was valid.I have read reviews that say their test did not match the result when sent in to a drug lab and I would warn people that this can be due to many factors and most do not relate to the strips. The ones which could be strip related are expiration, faulty storage, faulty manufacturing (it can happen with any lab test, including reagent based).The most likely cause, however, is that this is a urine test. Urine tests are notorious for being dependent on the concentration of the urine. If you test on a dilute urine and it is negative but then test on a more concentrated urine and it is positive, this is not an invalid result. The same goes for a concentrated urine coming up positive and another test being more dilute coming up negative. If you want to match test results, you would need to do blood tests or check specific gravity or creatinine levels for a THC/Creat ratio.Also you are comparing two different tests. One is based on a test strip and the other is based on an analyzer that used reagents and much better immunoassay techniques. With a strip (as in thin layer chromatography), the result is dependent on the person performing the test being able to distinguish colors and bands, variations in intensity/density, etc. These are also qualitative assays and a 50ng/mL cutoff will vary greatly above that limit. You may not be able to detect even over 100ng/mL by eyesight. Analyzers in a lab use photometers for detection.From what I have seen, I would place these up with any other well made test strip. I would just be sure to return any you get that are close to expiration, which will greatly deteriorate results and more than likely make them invalid. These would be of most use for testing kids or others where you want to know if they have been using cannabis as long as you know to use a concentrated urine (first void after waking works well). I would not use them during a period of fluid intake because that would defeat the purpose. You could also use this to get a ballpark figure of THC levels by serial diluting the urine and testing each dilution to see when it comes up negative. There is no way to know the actual level but if it takes many dilutions (like 1:20) you can be sure the level is fairly high and will take much longer to clear, even on a concentrated sample.

5.0 out of 5 stars Worked Great — Even Though I Didn’t End Up Needing Them

E. · July 16, 2025

I bought these just in case for a job that might test for THC, but ended up landing one that doesn’t care—lucky me. Still, I did try a few of the tests out of curiosity and they worked flawlessly. Super easy to use, clear results, and very fast. For the price, this 20-pack is a solid backup plan for anyone needing peace of mind. Definitely recommend!

5.0 out of 5 stars Accurate, Easy-to-use, Difficult to read

D.W.B. · April 9, 2019

The test kit is very easy to use and much less expensive than professional testing, but the results can be difficult to read. I used the test to analyze my results and, once those results were negative – I verified the negative results with a professional lab test.In my case, after leaving my previous job I vacationed outside the US for 6 weeks and smoked high quality marijuana daily for the entire time. THC level was probably in the upper teens and I smoked between one to two grams daily.Upon returning to the states I started my self-detox, and did not smoke ANY marijuana. With local labs charging $100 per test, I ordered these self-testing kits to determine my own results before spending the money for a lab test. I assumed the THC would clear my system in about one month, and was very surprised at how long it remained detectable.Day 37 of being completely weed-free: Started testing, got Positive test result. Not surprised, but disappointed.Day 40: PositiveDay 42: PositiveDay 44: PositiveAt this point I wondered if the test was accurate and asked a friend (who has never smoked) to take the test. The resulting bold line was clearly and obviously negative. The test strips were accurate.Day 50: Positive:Day 56: NEGATIVE. Very faint line, it was hard to be certain it was negative.Day 57: Positive. Not even a faint lineDay 58: NEGATIVE. Very faint lineDay 59: NEGATIVE. Line was clearly evidentDay 60: NEGATIVE. Very faint lineDay 61: NEGATIVE.With 4 consecutive negatives I paid for professional lab testing, and received a NEGATIVE resultDay 68: I had an employment screen, and the results were NEGATIVEI am very happy with how this test kit prepared me for my employment screen. It is possible that some of my positive results could have been interpreted as negative, and allowed me to take my employment screen sooner, but for my peace of mind I would rather be safe than sorry. If you just assume the THC will clear your system in a few weeks, you will probably fail your employment screen.I think this test kit is very helpful for people that want an economical method to check their system for THC. However, I think it you should also verify the results with a professional lab before an employment screen. The negative results shown on the test strip are difficult to read, and if you mistakenly read the results as negative you could face the consequences of a failed employment screen.

Quite accurate for the price.

M. · May 4, 2025

These are cheap, and work well. I expected that results would differ and sometimes give false positives or negatives but in my experience that has not seemed to happen. In my case id try 3 at a time and results would be the same between them all. Ive ordered these twice now and will continue to if i ever have to do a drug test.

Buen producto

A. · March 6, 2025

Llego efectivamente lo que solicité

Funciona bien

J.J. · February 26, 2025

Muy efectivas

Test antidroga thc

c. · November 23, 2021

Usato prima di fare test a lavoro, facili da usare e fatti a casa, con conferma di negativo,riscontrato a lavoro. Veramente comodi 15, ne ho usati 4 e tutti funzionanti

Ottimo, semplice ed efficace

L.G.A.M. · November 29, 2021

Funziona perfettamente, affidabile e semplice da utilizzare