http://www.all-detox.com/
Most all detox drinks will temporarily cleanse your system out to hide any drugs such as THC that may be in your system. There is no way they can tell if you have used one of these drinks, most realize these work.
They can get suspicious if the pee is very clear, although they still cannot prove anything if it does not test positive, but they can ask you to do the test again. To avoid this, take a vitamin B12 supplement to keep the yellow colour in your urine. Remember it is up to them to prove that you have taken drugs and not for you to prove that you have not. They do use scare tactics and some people fall for them too often.
As for drink products, some work better than others. I do not recommend drink products unless it is absolutely necessary. Here are the three most common myths on drink products:
Drink products rid the toxins from your system. Only time itself will remove toxins from your system. Drink products will only help minimize the toxin levels in urine.
The drink products must work because they offer money back guarantees. The guarantees that are used by many manufactures are the most dubious aspect of these products. To take advantage the double money back guarantees you need to provide a copy of your dissatisfied results. They do not tell you, getting a copy is nearly impossible because the company that paid for the test will tell you that you are not entitled to your results. Yes, you may be able to get your results but you usually have to spend lots of time and energy in doing so. Usually, people have more important things to invest their energy, like trying to find a way to keep their job or thinking of a way to find a new job. Suddenly, 30 dollars looks very unimportant when you are out of a job.
It is not the products that do the trick; it is the large amount of water that you drink does the most good. One thing that is common to all these products is that they require you to drink lots of water. I've seen these products come in capsule form, tablet form or drink form. Another thing they will all say is, drink lots of water. In essence, it is the water that does the trick and not the magical product. This is the real deal in regards to the drink products.
If they watch you take the p!ss test and you need to use a drink product then I recommend a company called who have some excellent cleansing drinks that do work.
For privacy reasons, they generally don't watch you pee when you do the test, unless it is for the Forces or probation services. So if they don't actually watch you take the test then all you will need for a negative test result is some 'Instant Powdered Urine', which again you can buy from Test Clear.
This product comes complete in a kit that includes an air activated heater that takes about 15 minutes to get at the right temp and will last between 4 to 5 hours.
good luck,
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disclaimer: the above was copied, edited, and posted on this thread from http://www.canedintotnes.co.uk/drhemp/past17.htm. In no way shape or form do I have any direct firsthand knowledge on using these techniques or methods. Take the above with a large grain of salt and proceed at your own risk.