Auckland Crown solicitor Simon Moore, QC, said he would be surprised if the practice was not happening here.
He said lawyers take into account what they know about a judge's likes and dislikes when they make submissions and he could understand if lawyers gave the same consideration to jurors.
"You're not perverting the process, all you're doing is modifying submissions based on what you know which is what lawyers do every day."
That sentiment was echoed by the chairman of the Law Society's ethics committee, Duncan Webb, who said a lawyer's job was to persuade.
"If you find out that the jury is [made up] of rednecks, or liberals, or teachers, or parents then it all goes into knowing how to persuade them."
But Mr Webb acknowledged there was a grey area, and said it could be unethical if lawyers played on jurors' prejudices.
University of Auckland law lecturer Professor Warren Brookbanks said he was not aware of lawyers using Google to research jurors and was not sure if the practice raised ethical issues.
"It's a question of how the information is going to be used."
Law Commission president Sir Grant Hammond said the issue will be looked at during a review of contempt laws this year.
Required information
What lawyers know about jurors before trials begin:
*Name
*Date of birth
*Occupation
*Address