Hi. I'm obviously not an Idaho cop, but you wouldn't be expected to be qualified prior to training. Most cops never saw a real firearm prior to getting hired and training. I'd be more concerned with passing the Physical testing.
You might want to have a look here then find out what qualifications the assorted police services want.
http://www.post.idaho.gov/Regions/Jobs.html#Reg1
http://www.isp.idaho.gov/career.html