The exact wording of the law allows for poession of a switchblade or gravity knife for use while hunting, fishing and trapping. This would allow for having in your house and going to or coming from those activities. Read the law under Levine's section on this forum. Beaware I was a NYC LEO and at least in the city I NEVER met a co worker who knew that part of the law that allowed for carry of this type of knife. I strongly suggest printing out that part of the law for ready reference. Buying, selling, trading etc is not legal unless you are a LEO.