TexasCHLforum.com

I'm also curious about why he had you get out of the vehicle. Seems to be an invitation to unnecessary problems.

It's obviously not the case here, since you got a warning, but I wonder if this would help prove the case against you in court if you claimed that the tail light had in fact been fully functional. Something along the lines of being able to say that he had you observe the non-functioning light and you didn't raise any objections at the time, etc.? Of course, a dash cam would solve that issue.