Is it grounds for a mistrial if all 12 jurors are white?

The racial composition of a jury alone does not automatically constitute grounds for a mistrial. However, if it can be demonstrated that the jury selection process was biased, discriminatory, or violated a defendant's right to a fair trial, it may provide grounds for a mistrial or an appeal. Courts generally evaluate whether the jury's makeup affects the fairness of the trial and the defendant's rights. Each case would depend on specific circumstances and legal arguments presented.