Hello again, please make sure your statute comports with mine, so we are on the same page.
If your caps are tinted, you need to show that the caps do not restrict (in any way) the light output. My concern here is that tinting that is customized (not as per manufacturer) - if this is the tinted tail light cap that came with the vehicle, you can be fairly assured that it is in compliance, so check that out. If it is direct from the manufacturer, I woujld get my documentation, take a photo to show it is the same as was provided when new, and you can likely win this case. If you did change it, you likely have a problem, if not under 321.404A but under 321.387 (see below), which requires identical replacement.
321.404A LIGHT-RESTRICTING DEVICES PROHIBITED.
1. A person shall not operate a motor vehicle, motorcycle, or
motorized bicycle on the highways of this state if it is equipped
with a device that restricts the light output of a headlamp required
under section 321.385 or 321.386, a rear lamp required under section
321.387, a signal lamp or signal device required under section
321.404, or a directional signal device as described in section
2. A person who violates this section shall be subject to a
scheduled fine under section 805.8A, subsection 3, paragraph "c".
321.387 REAR LAMPS.
Every motor vehicle and every vehicle which is being drawn at the
end of a train of vehicles shall be equipped with a lighted rear lamp
or lamps, exhibiting a red light plainly visible from a distance of
five hundred feet to the rear. All lamps and lighting equipment
originally manufactured on a motor vehicle shall be kept in working
condition or shall be replaced with equivalent equipment.
There is little you can probably do about the written warning - just make sure you didn't jazz up the vehicle to be louder than original.
As for windshields:
321.438 Windshields and windows. 1. A person shall not drive a motor vehicle equipped with a windshield , sidewings, or side or rear windows which do not permit clear vision. [Your officer may be asserting this is the case - it is your job for yourself to prove that the vision was still clear, despite the tinting. He may argue that 'tinting' be definition is not clear.] Again, if the manufacturer sold it this way from the factory, it will likely be helpful. If you decided to customize, more difficult.
2. A person shall not operate on the highway a motor vehicle equipped with a front windshield , a side window to the immediate right or left of the driver, or a side-wing forward of and to the left or right of the driver which is excessively dark or reflective so that it is difficult for a person outside the motor vehicle to see into the motor vehicle through the windshield , window, or sidewing. The department shall adopt rules establishing a minimum measurable standard of transparency which shall apply to violations of this subsection. [You need to get your hands on this - and if you do or don't, I would argue at trial that the state has the burden of showing what that min. is and proving via a measurable standard of transparency that you were in violation.] 3. Every motor vehicle except a motorcycle, or a vehicle included in the provisions of section 321.383 or section 321.115 shall be equipped with a windshield in accordance with section 321.444.
Thus, as you can see, whether you are in violation depends on these laws, whether your vehicle was customized such that it can be said to be outside the parameters here, etc. If you don't think the state can win, don't be shy about fighting it. The officer may have been citation happy out of jealosy of you new fun vehicle.
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