To start with, you have to have a naturally occurring sample of Creatine which would be used as the standard for the test that you are going to perform. During the test, they look for peaks in other substances that would be in the manufactured sample and compare it to the natural sample. The closer the two are, the higher the quality or purity of the manufactured Creatine. None of the athletes interviewed wanted to go on the record but all of them did say that they thought that Creatine was a good thing because of the recovery time being shorter in between workouts. With the use of Creatine, this period of time becomes shorter so the athlete can work out more often.
Some athletes drink large quantities of water hoping to avoid such effects.
Graham and Hatton add that Creatine is also known to be osmotically active, so that higher intracellular Creatine levels may redistribute body water from extra-cellular fluids or from the general circulation into muscle cells. In laymen's terms, this means that the body would retain more water by taking this supplement.