At the risk of opening a can of worms, what species of snail? Cornu aspersum is pretty complicated to keep legally, but unfortunately very commonly sold.
Edit: this might be helpful:
https://www.aphis.usda.gov/organism-...s/snails-slugs
Hit the button for 'Mollusc Decision Matrix', where C aspersum is listed under the synonym Helix aspersa. There are a few other species listed too, which might be useful to know about.