Trayvon Martin's father testified Monday that he never denied it was his son's voice screaming for help on a 911 call, contradicting police officers' earlier testimony at George Zimmerman's second-degree murder trial. Tracy Martin was the latest in a series of witnesses called by lawyers on both sides as they seek to convince jurors of who was the aggressor in the nighttime confrontation that left Trayvon Martin, an unarmed Black teenager, dead in February 2012.

Later in the day, the Florida judge ruled that defense attorneys may present evidence to the jury that Trayvon Martin had marijuana in his system when he died. The teen's father testified that he merely told officers he couldn't tell if it was his son after his first time listening to the call, which captured the audio of a fight between Martin and Zimmerman.

"I never said that wasn't my son's voice," said Tracy Martin, who added that he concluded it was his son after listening to the call as many as 20 times.

Read it at Associated Press.