Boy, that's the head in the sand opinion of performance enhancing drugs.
The NFL loves fans like you.
The "testing" you seem to say is so stringent and catches everyone is a joke. Has been forever. Not even close to Olympic standards and those aren't really where they should be (if you think there is no PED's in the Olympics because they "test" you aren't paying attention).
There is only ONE way to really do effective drug testing and that is to take blood from a person who is perfectly clean (and how/when we do that is up to debate) for about 3-4 months on a regular schedule and create a baseline of what that person's "blood" looks like and then every test after that has to be close to that baseline. It has to be blood tests.
The current urine test is known to have a wide range, so the test requires an absurd "out of range" testosterone level to trigger a positive test. Something like FOUR times the normal testosterone ratio for your normal everyday 25 year old.
The truth is, there is no reason for an athlete NOT to try and monitor and increase his testosterone on a small scale (even twice the testosterone would provide a significant increase in muscle production and recovery). Plus the use of HGH (which is not being tested for) works best when combined with some form of low-level increases in testosterone.
I suspect over 50% of all NFL athletes are doing some type of low level testosterone boosters along with some type of growth hormone. It's all such a perfect science now that cocktails of creams, testosterone boosters, HGH, supplements and diet can yield HUGE results. And there are nefarious individuals and companies that hide behind the supplement industry (with no oversight) and are basically just human chemists that know exactly what really works and can get past the tests.