Is it possible to beat the test by adding chemicals to the sample?
If the subject dilutes the sample with water or adds chemicals such as bleach to the sample, the test strips will indicate that the sample has been adulterated. If the subject attempts to supply urine that was stored in a jar, the thermometer on the test cup will clearly show that the urine sample is not fresh. In he case of an invalid test result, it would be justified to be suspicious of an attempt to beat the test.