HI edge, I do have some wonderment about your situation.
you WERE wearing a DOT class helmet?
doing LESS than 30mph?
did display proudly your Mandatory Moped license plate?
were obeying all laws at the time?
Were NOT having a modified excessively loud exhaust?
You had M2, M1 or permit in pocket?
I don't know why you would have been stopped if all these CA basics were in place?
IF you were all in compliance, then I'd be presenting to the Judge, that you do not understand the motive for stopping you.
IF, tho, you fell short in any catagory, you may not want to mention any of that, and just take your lumps.
Let me know what is going on with you, as I remember Monrovia is a Los Angeles Suburb?
Mike