Whoooop, you are getting your legal terms mixed up. Probable Cause is used to search a car without a warrant or make an arrest without a warrant. Probable Cause simply means the officer is at least 51% sure.
The legal minimum for a traffic stop is "reasonable suspicion". Reasonable suspicion is something the officer can articulate that is one step higher than just a hunch. So in this scenario no way in hell that the misdemeanor criminal summons will be dismissed.
Since this is a misdemeanor crime, it goes on his permanent criminal record as well. Typically a school security officer would not know as much about traffic law as a traffic enforcement officer. Hope this helps.
It would take an extremely expensive lawyer to make the 'no probable cause' case for you. And I'd bet $100 that that lawyer would advise you that you don't have a case to be made. If the text was NOT obstructing your rearward vision, I'd take a photo of it and enter it as evidence during your appearance.
If it was, I'd find the relevant law myself and see what it has to say. You can start with the statute used by the officer who wrote up the ticket. As for DWL, it is what it is.
Hopefully, your state had previously issued you a license; if it hadn't, I'm not sure I'd bother going to court to argue over the obstruction of vision citation. Courts generally frown on citizens who aren't getting the basics right in the first place (read: you won't get the benefit of the doubt regarding the other issues at hand, like the obstruction of vision). Good luck.
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