Congratulations. I'll avoid a long post... but the number of times I have personal knowledge of the cops/DA just making up the evidence, or ignoring obvious defects in the evidence, is incredible. This happens in murder trials, arson trials, etc. It's scary if you know someone with the real story.
There are some honest cops out there - I know some - but I think they are in the minority.
The key fact is that these laws *vary by state*. Advice that is good for one state is often useless in another. (Except Federal Law; Yes, you *can* get a Federal speeding ticket, I know... 'cause I did once. :-(
Bob