The Sanford Police Department insisted there was no authorized release of the new information but acknowledged there may have been a leak. City Manager Norton Bonaparte Jr. said it would be investigated and the person responsible could be fired.
Martin family attorney Benjamin Crump said the link between the youth and marijuana should have no bearing on the probe into his shooting death. State and federal agencies are investigating, with a grand jury set to convene April 10.
"If he and his friends experimented with marijuana, that is completely irrelevant," Crump said. "What does it have to do with killing their son?"
The state Department of Juvenile Justice confirmed Monday that Martin does not have a juvenile offender record. The information came after a public records request by The Associated Press.
Despite the news of Martin's possible actions the night of the shooting, rallies demanding the arrest of the 28-year-old Zimmerman spread from Florida to Indiana.
Thousands rallied Monday on the steps of the Georgia state Capitol. The crowd chanted "I am Trayvon!" and "Arrest Zimmerman now!" The protest ended with the crowd linking hands and singing, "We Shall Overcome."
Students from Morehouse College, Spelman College and Clark Atlanta University encouraged their fellow students to talk to their lawmakers about gun laws. Students wore hoodies that said, "I am Trayvon Martin" and lofted signs reading, "Don't shoot!" and "I could be next."