Many drug-tested athletes use what I call the "duck and dodge" technique. Several journalists in the UK have recently referred to it as the "duck and dive" technique. This is basically how it works.
First, the athlete repeatedly calls their own cell phone until the message capacity is full. This way the athlete can claim to the testers that they didn't get a message when they finally decide to make themselves available. Secondly, they provide incorrect information on their whereabouts form. They say they are going to one place and then go to another. Thereafter, they start using testosterone, growth hormone and other drugs for a short cycle of two to three weeks.
After the athlete discontinues using the drugs for a few days and they know that they will test clean, they become available and resume training at their regular facility.
Most athletes are tested approximately two times each year on a random out-of -competition basis. If a tester shows up and the athlete is not where they are supposed to be, then the athlete will receive a "missed test". This is the equivalent to receiving "strike one" when up to bat in a baseball game. The current anti-doping rules allow an athlete to have two missed tests in any given eighteen-month period without a penalty or consequence. So, the disadvantage for an athlete having a missed test is that they have one strike against them. The advantage of that missed test is the athlete has now received the benefit of a cycle of steroids. Long story short, an athlete can continue to duck and dive until they have two missed tests, which basically means that they can continue to use drugs until that time.