Ultimately, many of the photos and cellphone records of Trayvon Martin released online Thursday by George Zimmerman’s defense attorneys – indicating that the slain teenager smoked marijuana, got into fights at school, and had an interest in, and perhaps access to, guns – may be ruled inadmissible in court. But they are already making the rounds in the court of public opinion, which can influence everything from fundraising efforts to the mind-set of potential jurors in Mr. Zimmerman’s murder trial.