Good question but I'm not sure what the answer would be. However, it'd be much more difficult for you to use the "this is what I learned" line then...Thank you for the information, AV80R. The letter of warning is for a 2 year period.
Although I certainly do not want to jinks myself, what would the consequences be if I recieved another letter within the 2 year period?
Also, when infractions are being evaluated, they DO look at your past history. So it's quite possible an identical infraction would've given you a license suspension for let's say 30 days versus a warning letter. After all, the intention of a warning letter is to warn you not to do it again.
It's all a guess, just stay out of trouble now and you'll do just fine!