Zimmerman, who was charged with second-degree murder, claimed he shot Martin in self-defense.
Martin's mother said she believes the verdict sends a "terrible message to other little black and brown boys."
"They can't walk fast. They can't walk slow. So what do they do? How do they get home without people assuming you are doing something wrong?," Fulton said.
Fulton told "CBS This Morning" her son was not a burglar.
"He simply went to the store and was headed back home," she said. "And for somebody to look at him and perceive that he was a burglar, that was the problem that initiated everything."