Did you only get tagged for the windshield? CA is getting very aggressive in ticketing motorcycles that have ANY exhaust changes from stock. It is an EPA violation to modify a stock exhaust in any way (yeah, that means any aftermarket not DOT stamped exhaust part is illegal no matter how quiet). Most states require rear reflectors. A lot of states require a rear plate to be displayed perpendicular to the ground and to have lights on it. Most of our bikes could be ticketed for unlawful equipment. Never heard of the windshield thing though. If that's all you got ticketed for you might be able to have it dismissed. Be careful though, some states allow a prosecutor to tab charge you for additional offenses after the fact if the officer wrote down all the details in his notes for the violations he warned you for.