Why were D. J. Williams and Ryan McBean sentenced to bans?

The National Football League banned the linebacker D. J. Williams and defensive lineman Ryan McBean of the team Denver Broncos for violation of steroid policy. These players were banned from 6 games. But they were not banned for application of steroids. They didn’t test positive for steroids or other forbidden drugs. They were accused in providing “non-human” urine samples to the drug testing officer.
D. J. William said in an interview that he had never tested for any banned medicine during eight years of his career. He noticed that he was proud of his records. He noticed that he was also proud of his manner in that he conducted himself, being a sportsperson.
Peter Schaffer, the defensive attorney for McBean, claimed that the NFL had violated rights of the defensive lineman. He noted that since McBean had never tested positive for any forbidden drug, the NFL didn’t have any right to sentenced him to ban.
Peter Schaffer mentioned that he wanted to make it clear that neither D. J. Williams, nor Ryan McBean tested positive for forbidden medications.
A lawsuit was filed in Denver County Court against suspensions of these football players.
D. J. Williams and Ryan McBean affirmed that the drug testing officer had violated some rules connected with the procedure of collecting urine samples.
Peter Schaffer noticed that certain similarities had been between his client and Ryan Braun. Braun won his appeal linked with his suspension from 50 games for usage of testosterone. Ryan Braun could prove that the drug testing officer Dino Laurenzi violated steroid policy.
As for Laurenzi, he was defended and supported by different anti-doping agencies. The WADA also supported Dino Laurenzi. It was confirmed that there was the same procedure of collecting and sending urine samples not only for the MLB but also for the WADA.
But as for the drug testing officer that collected samples of Williams and McBean, he was treated in another way. He was fired by the NFL for wrong doing his duty.
At the hearing the NFL administrators admitted that the drug testing officer violated the chain of custody for urine samples.
Nevertheless, the appeal on behalf of the players was rejected.