I will give you an example of the rulings that Judge Nelson has made. I think they are biased:
The prosecution objected the day after the lead detective had answered a question and said that he believed George Zimmerman's story was truthful. She allowed the prosecution to object and strike the question and answer in front of the jury. What Judge allows a party to object the day after?
The allowance of the George Zimmerman's school records. Her reason, "Well, it's the prosecution's theory. They should be allowed to prove their theory." She would not allow Trayvon Martin's records in. Doesn't the Defense have a right to present a theory? And besides if Zimmerman was such a law wizard, didn't he know enough to keep his mouth shut when he was read his Miranda Rights?
The medical examiner changed his opinion that the level of THC in Trayvon Martin's blood could influence his behavior. She still would not consider it as evidence or even a hearing. She said she ruled on it, and it's a closed matter.
Don West had asked to approach her for a question. Denied. Again, saying it's important. Denied. It's on this youtube at 27:00
http://www.youtube.com/watch?v=aSr6EJswS_g
She didn't allow the deposition of Benjamin Crump, the Martin's attorney. She said that the Defense had plenty of time to arrange the deposition. O'Mara replied that they have been busy with the case and Crump has not presented any times for the deposition. She lost the appeal.
The Defense asked for a continuance before the trial began saying that they needed more time to get ready. Denied. Other high profile cases have been delayed many times, e.g. Jodi Arias trial.