Hi kathymarie,
You are right in assuming that we cannot provide a nail service to clients with fungal nail, It's just not what we can do as manicure/pedicurists. Podiatrists/chiropodists can but we can't. They are the experts in foot care......and I have often referred clients on. However you are trained in the US so check exactly what is allowed.
One of my clients had it on her toe nails and she did not paint her toes for a full year whilst on the anti-fungal medication. It worked well and her nails have never looked so normal. I have never seen it on fingernails however.
Cuccio make small one client use disposable mani/pedi packs.... so that cross contamination is avoided if you need to look into something for the future.
Hope that helps.