The diluting strategy involves adding water to the urine sample directly. Doing this reduces the concentration of drug metabolites that might be found in the sample. This is a much more reliable strategy that attempting to dilute your urine by drinking large quantities of water, due to the fact that you are able to control the amount of water that goes into the sample. The main difficulty is having the opportunity to take in and add the water. You should also be aware that getting caught diluting a urine sample (or tampering with it in any way) may land you in serious trouble. In some states this is even a criminal offence.
Diluting is such an appealing technique that is attempted so often that testing agencies have responded by cutting of the water supplies to bathrooms where the test is taking place and filling the toilet bowl with a colored dye. If the water in the toilet has not been artificially colored, then the subject may be able to dip their sample cup into the bowl and quarter fill it with toilet water. The sample would also need to contain some urine in order to be effective because the test will easily be able to reveal if the sample is water only. Spilling water onto the outside of the sample container is a clue to the collector that you have attempted to dilute the sample, so if you are trying this, make sure that you wipe the outside dry.
If the toilet water has been dyed, some subjects get around this by opening the tank and getting the clean water that can be found in the toilet reservoir. The reservoir will usually contain a plastic tube that is full of fresh water. Pushing down on the float in the reservoir makes this turn on the water supply. This is a relatively easy process, but the problem is that it can be loud. Collectors at drug sites will be paying careful attention to any unusual noises coming from the stalls. Also, modern bathrooms are often built in such as way that the reservoirs aren't accessible. This strategy would also not work with a urinal.
Dangers of Dilution
Dilution involves two main dangers. Firstly, the Collector will detect whether or not the temperature of the sample is within an accepted range. One possible way around this was advised by Abbie Hoffman in his book "Steal this Urine Test". He says that you could rub the outside of the sample container with your hands in order to raise the temperature of the sample. This however, may not be enough. In a regular bathroom, you may be able to use water from a hot tap, but this could make the sample temperature too hot. Generally speaking, if the water has a tepid temperature, it will be close to body temperature.
Secondly, the color of the sample may be affected by dilution. The addition of water to a urine sample will obviously make it a paler yellow and this could result in detection of the tampering. One way around this, according to Hoffman, may be to take large dosages of Vitamin B before giving your sample as this will increase the yellowness of your urine. Then when water is added, the urine sample will still be a realistic pale yellow.
It could be Criminal
It is important that you understand that, in at least two states, tampering with a drug test is a crime. In Nebraska there is a law that states that anyone found to be tampering with bodily fluids that are being used in a drug or alcohol test can be charged with a Class I misdemeanor. This means that if you add water to a urine sample in Nebraska you will probably be charged. In Texas there is a law that says using an additional substance in order to falsify drug testing is a crime. So again, if you add water to a urine sample in Texas you will probably be charged with a misdemeanor. More state are sure to be toughening up their drug testing laws be enacting similar legislation in coming years.
Apart from dying the toilet water, drug testers are attempting to prevent dilution by using what has become known as the "dry room". This is a room that has no accessible water which means that dilution is almost impossible. Taps are sealed and the toilet contains the smallest possible amount of water that may also be dyed. The reservoir tank of the toilet is usually secured so that subjects can't get water from it.
One method that has worked effectively in some cases has been using an intravenous (IV) saline bag that is taped to the subject's arm. The 250cc IV solution can usually be purchased in drug stores and medical supply stores without a prescription. The only safe method is to use a pure saline solution, anything else might contain other detectable chemicals that will reveal your attempts to dilute the sample.
The IV bag is generally taped under the subject's arm where it is in a good position to retain body temperature. The tube runs down the person's front to the groin area. When the sample is being given, the subject puts a small quantity of urine into the specimen cup and then fills the rest of the cup with saline solution squeezed out of the bag. The observer will typically be behind the subject or outside a cubicle, so they won't be able to see the tube.
Using a saline solution is a high risk technique. If you are caught using this method there will be no other plausible reason for having a IV bag taped to your arm. You will be treated as a guilty drug-user and it is also likely to be a humiliating situation.