It is almost impossible to get out of showing up the first day, but when you fill out your questionnaire you can torpedo your chances of being called by saying 1. You are a photographer for a pornography publication 2. A former photographer 3.Have had a close friend/relative injured/killed in a drunk driving incident 4. Have had a close friend/relative convicted of drunk driving and just for good measure you might mention your past appearances in the pornography, but I doubt that's necessary.
I think a defense lawyer wouldn't mind the photography gig but the prosecution will. The defense will hate the lost relative in the dui.
A couple of hours, you get your fuel voucher and your parking validated and you are back on your way. Under no circumstances fail to show up.