wireless vendor return policy

I just came across this disclaimer in an ad for a popular Shure wireless mic from an
online vendor:

"This item cannot be returned. Microphones (all types), Harmonicas, Ear Plugs, In-Ear Monitors, Heil Talk Boxes, and any other items that touch your mouth, your nose, or your inner ear cannot be returned once opened due to health laws. Please check carefully if you think you've found a place you can buy this product and return it, as this is a common practice amoung music retailers."

I'm curious to know what others may have seen/experienced regarding return policies on wireless mics?