A traffic ticket is not likely to jeopardize your career in law enforcement. File your declaration setting forth your grounds. The officer then must file his own in support of the ticket but hopefully he'll be too lazy to do so. If you lose the TBD request a new trial and make a demand for discovery of the information you need. If you are really serious about this a traffic attorney can do it more easily than you.
When you file file a TBD you really do not have an opportunity for discovery such as radar logs, etc. If the officer does not respond-you win. Do not admit to going over the speed limit in your TBD. If you lose the TBD then you can request a trial de novo and get the discovery you desire. A traffic ticket attorney would be most helpful here. Fighting a ticket should in no manner have any bearing on you becoming an officer.
Consider investing twenty five bucks in a copy of "Fight your Traffic Ticket and Win in California," published by Nolo Press. It's a great overview of the California traffic court system, with lots of helpful tips that couldn't possibly be listed here.
It's available at most bookstores, and at online retailers like Amazon.