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crackityjones · 05-12-2007, 04:23 PM

I noticed that there are two different versions of the First Check marijuana tests. The only kind I could get ahold of was the one with the eyedropper type thing, but I noticed online that they sell a different kind that uses a cup device to detect the THC. Do both of these have the same accuracy? It made me nervous since the other version only requires four drops of urine in a small device to determine THC.

Bilbo3452 · 05-12-2007, 04:38 PM

I used the one with the eye drop and it proved to be accurate for me. It told me I was negative, and i just had the results confirmed by the lab. If you are unsure with the results, use another test. The test claim that they are 99.9% accurate, if two of the test show the same results the accuracy is even greater than that.

1tokeovertheline · 05-12-2007, 07:56 PM

Quote:

Originally Posted by Bilbo3452

I used the one with the eye drop and it proved to be accurate for me. It told me I was negative, and i just had the results confirmed by the lab. If you are unsure with the results, use another test.

Thanks. That info may calm the nerves of someone that has a drug test.

Quote:

The test claim that they are 99.9% accurate, if two of the test show the same results the accuracy is even greater than that.

I used to think the same thing until a doctor put me straight on it. He told me "if you have 2 tests and the results of them are 99.9% accurate, that is all you are going to get is 99.9% accuracy." Then he went on to say " According to what you think the it would be 199.8% accurate which is impossible. A test that has 99.9% accuracy will remain 99.9% accurate. It doesn't matter how many times you repeat the test you can never get over the 99.9%."
It made sense to me and maybe it will make sense to you too.

**Sec** · 05-12-2007, 09:30 PM

It is the same principle as when you flip a coin 10 X and get heads each time. The odds of you getting heads again on the 11th flip is still 50%.

Bilbo3452 · 05-13-2007, 02:20 PM

Yeah, you guys are probably right. I just took a really hard statistic class and I guess I really haven't grasped the materially. But, we did specific examples in class relating to conditional probability i.e. if a test is 95% accurate, what is the chance that someone tested postive, when they are actually negative? The answer is that 16.67% results are false-positives. When my teacher told us that, I was very shocked, it makes you think twice about the accuracy in those drug tests.

05-12-2007, 04:23 PM	#1
crackityjones New Member Join Date: Apr 2007 Posts: 4 Grams: 802.60 Groans: 0 Groaned at 0 Times in 0 Posts Thanks: 0 Thanked 0 Times in 0 Posts Stock Portfolio Total Value: 0.000 Gain/Loss: 0.000%	Question about First Check tests I noticed that there are two different versions of the First Check marijuana tests. The only kind I could get ahold of was the one with the eyedropper type thing, but I noticed online that they sell a different kind that uses a cup device to detect the THC. Do both of these have the same accuracy? It made me nervous since the other version only requires four drops of urine in a small device to determine THC.

05-12-2007, 09:30 PM	#4
Sec Super Moderator Join Date: Dec 2005 Posts: 6,377 Grams: 42,653.63 Groans: 16 Groaned at 30 Times in 25 Posts Thanks: 698 Thanked 1,570 Times in 972 Posts Stock Portfolio Total Value: 0.000 Gain/Loss: 0.000%	It is the same principle as when you flip a coin 10 X and get heads each time. The odds of you getting heads again on the 11th flip is still 50%. __________________ Guidelines. Search http://www.marijuana.com/drug-test/index

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05-12-2007, 04:38 PM	#2
Bilbo3452 New Member Join Date: May 2007 Posts: 17 Grams: 937.40 Groans: 0 Groaned at 0 Times in 0 Posts Thanks: 1 Thanked 0 Times in 0 Posts Stock Portfolio Total Value: 0.000 Gain/Loss: 0.000%	I used the one with the eye drop and it proved to be accurate for me. It told me I was negative, and i just had the results confirmed by the lab. If you are unsure with the results, use another test. The test claim that they are 99.9% accurate, if two of the test show the same results the accuracy is even greater than that.

05-13-2007, 02:20 PM	#5
Bilbo3452 New Member Join Date: May 2007 Posts: 17 Grams: 937.40 Groans: 0 Groaned at 0 Times in 0 Posts Thanks: 1 Thanked 0 Times in 0 Posts Stock Portfolio Total Value: 0.000 Gain/Loss: 0.000%	Yeah, you guys are probably right. I just took a really hard statistic class and I guess I really haven't grasped the materially. But, we did specific examples in class relating to conditional probability i.e. if a test is 95% accurate, what is the chance that someone tested postive, when they are actually negative? The answer is that 16.67% results are false-positives. When my teacher told us that, I was very shocked, it makes you think twice about the accuracy in those drug tests.

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