Before anyone asks I am not a juror, I'm not researching things during a case, I promise I'm not being contemptuous inside or out of a court :)
There are a number of strict rules about what a juror can do during a trial. He can't talk to others about the case itself, look up more details about what happened in the case, or try to investigate the case itself. There are good reasons for all of this. I'm wondering though if there is any room for any kind of research within those rules in his attempt to be the best juror he can be?
So lets look at the 'most forgivable' attempt a juror could attempt to try to help him make a decision. If A juror, in the evenings between trial dates, were to research legal theory and presidents relevant to the trial he is a juror on, but nothing about the specific case, would this be permissible for him to do?
For example say our juror felt the (often deliberately obfuscated by one of the lawyers as I understand) instruction given to the jury prior to the start of the case was so confusing he didn't know what his responsibilities were, so he tried to look up what the jury legal expectations online. Or as another example maybe he vaguely recalled something about jury nullification being possible and wanted to argue for it in this case, but first researched the particulars about when and how a jury was allowed to nullify a case. Would this potentially be considered permissible?
Moving on to an even 'greyer' level, what if the Juror were to read about a scientific principle that could be relevant to how he would vote online, without asking about any of the specifics of his case? lets say a mother is on trial for causing her babies death and one expert says they are 100% certain the death was caused SIDs or some other disorder and there is no way the mother was responsible and the other expert says there is no way that SIDs could be responsible and the evidence is clear that the mother killed the child. If our Juror felt like he didn't know enough about SIDs to have any idea which expert he should believe and decided to hope on the Wikipedia page on SIDs and read about it in more detail in hopes of being better able to judge which expert's testimony felt more logical afterwards is there any chance this could be permissible?
And to throw out an almost certainly not allowed example, if the Juror looked up the two experts and saw that one was highly respected and the other has been accused of accepting high fee's to provide expert testimony that happens to fit whatever the lawyer wants to prove, causing our Juror to rule for the side with the more respected expert, I'm guessing he would get removed?