From ESPN.com:

 Seattle Seahawks cornerback Richard Sherman, who is appealing his four-game suspension for performance-enhancing drugs, has argued that his urine specimen was contaminated while being collected for testing, a league source told ESPN. 

A major part of Sherman's appeal, which was heard Friday, involved his claim that the cup containing his urine specimen was leaking, prompting the collector to place a second cup underneath it to capture any leakage, the source said.

Sherman stated that the second cup's seal already had been broken before being used to stop the leakage from his cup, according to the source. Since the second cup's seal was broken, the chain of custody also was broken, therefore nullifying Sherman's positive test for Adderall.

 

Sherman and his representatives argued that his tested urine sample was contaminated as a result of the second cup. If the collector confirmed the second cup's seal was broken, there would be grounds for Sherman escaping his suspension.

 

A verdict is expected to be handed down this upcoming week, but Sherman will be permitted to play in Sunday night's crucial contest against the NFC West rival San Francisco 49ers.