WADA can’t make sports “clean”

Recently Alan Abramson published an article where he noticed whether tests conducted by the World Anti-Doping Agency (WADA) were effective.
The WADA conducts many tests for steroids and other related preparations each year. It seems that those that administer steroids are caught. Someone may believe that the world of sports and professional bodybuilding will be soon cleansed from usage of banned products. For example, a lot of tests for forbidden drugs have been conducted at the 2012 London Olympics.
But certain questions appear here. Are these tests sophisticated enough to detect any athlete who dopes? Are these tests efficacious?
Let examine results of certain tests. In 2010 the WADA published statistics according which 258,267 samples were analyzed by 35 WADA-accredited labs. Out of these samples 4,820 results represented atypical findings. Circa 60 % of positives indicated about usage of steroids. Numerous positives were for cannibinoids. 10 % positives were for marijuana. As you observe, only 60% out of those who administered banned medications applied steroids. Is it real? Don’t manifest the results of the tests that the WADA doesn’t do the job properly?
The former president of the WADA Dick Pound considers that at least 10 % of sportspersons that competed at the 2012 Summer Olympics used steroids. He confirms that those consumers of steroids that are not clever are caught by anti-doping officials. He also notes that a sportsperson who has been caught applying banned medications will fail an IQ test. He concludes that just unwise athletes don’t avoid detection.
So, when you hear that the WADA has conducted many tests to make sports clean, consider whether these affirmations are true. Is able the WADA to make competitions fair? Why does the WADA notice about number of tests?
It seems that the WADA only desires to convince people that the job is done appropriately. The WADA put efforts to secure future funds. It is the reality.