When i served on a grand jury i continued to blaze everyday. Then again a grand jury is a little different. We had to vote if there was enough evidence for a case to go to court. If we indicted* they would go to court and have a fair trial, if we voted no the case would be pushed aside until more evidence could be found. I do not think me being slightly high had affected my votes in anyway. In fact our votes were unanimous the entire time cause the cases were realy straight forward.
*indicted? not sure on spelling