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Can anyone recommend a shampoo that has actually worked in passing a hair strand test for drugs and alcohol?

Yes you can detect alcohol consuption in hair. When you drink alcohol it metabilises in your body and makes something called EtG, the more you drink the more EtG is made this thengrows into the hair...

Does anyone know how the calculation is done for hair strand tests for alcohol. I have done a lot of reading on it but can't seem to find an answer to this. I know that 1.5 inches is usually taken...