Here's an old article about the SP jurors and the boat. The judge would not declare a mistrial at the time, but Scott's legal team and family are still appealing.
Peterson trial jury rocks the boat – East Bay Times
The third full day of deliberations began with a couple of jurors hopping inside Peterson’s fishing boat and rocking back and forth to test its stability, an action that incited defense attorney Mark Geragos to demand a mistrial.
“At least two of the jurors were rocking around, and when I say rocking, I mean rocking,” Geragos said in a brief hearing after the viewing of the boat. Geragos asked the judge to declare a mistrial or at least allow him to play for the jury a defense-produced video demonstration of the boat’s stability, previously barred as evidence. The defense contention is that the boat would have capsized if Scott Peterson, as prosecutors believe, had tried to dump his pregnant wife Laci’s 153-pound body into San Francisco Bay.
Judge Delucchi denied both requests.
During Monday’s viewing, Delucchi reminded the jury that the boat was not in the water, it was on a trailer, and that they should consider that fact in their deliberations.
Geragos said the jurors’ actions in the boat amounted to an “experiment,” which the law prohibits. They are to only use the evidence presented in court in their deliberations.