I debated on where to put this. LEO only. Restricted LEO and civilian. However, I decided to put this thread here just because.
Here is a link to Louisiana's DWI submittal, refusal and conviction rate from 1999 to 2007.
Table A27: DWI Convictions, Submissions and Refusals
Note how when the offenses increase the convictions go down dramatically. The reason behind this is because when the offense increases so does the penality. A first offense DWI is a misdemeanor. The 894 denotation is Article 894 explained here.