WADA is not able to cleanse sports from steroids

Recently Alan Abramson published an article where he noticed whether tests conducted by the World Anti-Doping Agency (WADA) were effective.
The WADA conducts more and more tests for steroids and other related medicines each year. It seems that steroid users are caught. One may think that the world of sports and professional bodybuilding will be soon cleansed from administration of forbidden medications. For example, a lot of tests for banned preparations have been conducted at the 2012 Olympic Games.
But certain questions appear here. Are these tests sophisticated enough to detect any sportsperson who dopes? Are these tests efficient?
Let meditate over results of some 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 were atypical findings. About 60 % of positives indicated about application of steroids. Many positives were for cannibinoids. 10 % positives indicated about usage of marijuana. As you observe, just 60% out of those that took forbidden medications applied steroids. Is it real? Don’t display the results of the tests that the WADA doesn’t do the job properly?
Dick Pound, the former president of the WADA, considers that at least 10 % of sportspersons who took part in the 2012 Olympics applied steroids. He claims that those steroid users that are not clever are caught by anti-doping officials. He also affirms that an athlete that has been caught applying banned medications will fail an IQ test. He concludes that only unwise sportspersons don’t avoid detection.
So, when you hear that the WADA has conducted numerous tests to make sports clean, think whether these affirmations are true. Can the WADA make competitions fair? Why does the WADA note about number of tests?
It seems that the WADA just desires to convince people that the job is done properly. The WADA wants to secure future funds. It is the reality.