Seeing that this house is only a year old, I would say if the electrician installed non ic cans in a ceiling to be insulated I would have him back there to replace them all anyway. Here in MA you have to use ic air tight for insulated space or you wont pass building inspection. Also there is a building code requirement that says you must use gaskets on device covers in a wall that seperates heated from unheated space. (exterior wall) I have yet to see that enforced.
