David Howman: anti-doping system is proper in International Tennis Federation

David Howman expresses his thoughts about anti-doping programs in some sports organizations. While the director general of the WADA seems to be happy with jobs of some sports organizations, he claims that anti-doping systems in other leagues/teams are not appropriate.
For example, David Howman praises the International Tennis Federation (ITF) for its anti-doping system. The director general of the WADA confirms that anti-doping system is appropriate in tennis.
But as for the National Basketball Association (NBA), it doesn’t want to adopt its anti-doping system to that of the WADA. It doesn’t agree to add certain new drug tests in order to catch those that use steroids and/or other banned drugs. That’s why David Howman claims that the anti-doping policy of the NBA is not good enough to catch those that dope. He confirms that the NBA should add more sophisticated new methods as well.
David Howman confirms that drug tests conducted in tennis are of high quality. But there is a defect in tennis’ anti-doping system. Many tests take place during competitions. But few tests are conducted out-of-competition. That’s why ITF’s anti-doping policy is also criticized.
Of course, nobody can confirm that anti-doping program of ITF is perfect. It has certain lacks too. But it is quite adequate.
Thus, you should not think that tennis is clean from doping wholly. Some tennis players are likely to use steroids and/or related products. But it is not so tainted, as some other sports.
 Only one tennis player was suspended for usage of prohibited preparations. However it seems to prove that tennis is clean, it is important to take in consideration that there are certain ways to avoid detection. As you probably know, the famous cyclist Lance Armstrong administered steroids and other related preparations and avoided detection much time. Couldn’t tennis players dope and use the same methods?