The only spots I was ever able to grow facial hair were my upper lip and chin. My skin is extremely pale and my hair essentially black, thus making the 'shadow' extremely visible despite the facial hair being very sparse; obviously this carried with it the benefit of making me perfect for laser, and the results were DRAMATIC.
As awful as a '10 point passing scale' sounds, I'd say I gained a solid 3-4 points after going through laser. Be warned though; it is EXCRUTIATING XD