This looks like it could be hard to beat. Dates are reasonable since the stop happened 2 minutes before midnight on 9/2 so the citation and statement would be done a few minutes later, technically the next day. Radar certification is up to date, statement says he tests at beginning and end of shift and notes he will advise court if it fails the end of shift test, which is reasonable with the notes written in the middle of the shift.

Remember that the standard for this ticket is preponderance of evidence, not reasonable doubt and the officer will not appear unless your son subpoenas him. Usually these are convictions unless you can find grounds for excluding the radar reading. Maybe someone else will find an error I missed.

Good luck.