As far as the legality of OC spray, from the Star Bulletin 2010..
http://archives.starbulletin.com/content...ound_check
If you are 18 or older, it is legal for you to buy pepper spray for self-defense from a licensed retailer, under Section 41-37 of the Revised Ordinances of Honolulu.
There are no restrictions on people with a previous criminal conviction, including felonies, according to the Honolulu Police Department.
We also checked with a gun shop in Honolulu and were told that they are required to check IDs to make sure a person is at least 18 years old and to record the sale of the pepper spray, but otherwise do not do any background check as they do for firearms sales.
Pepper spray is defined as any aerosol container or other device designed to fit into a handbag or a pants pocket and has a trigger-guard, flip top or other mechanism to prevent the accidental release of the spray; that emits only oleoresin capsicum or a derivative; and that contains a nonflammable propellant and/or carrier.
It is illegal to use pepper spray for any purpose except in self-defense, in defense of another person, or to protect your or someone else's property.
There is nothing in the law specifying concentration levels of the oleoresin capsicum, which is the product of a process that begins with an extraction from peppers.
Much of the Honolulu law deals with the seller, who not only has to be licensed but has to provide a briefing about the spray before completing the sale, including proper use and disposal of the spray, and its limitations; get a signed acknowledgment from the purchaser that a briefing was given; post a copy of the license; and keep records of pepper sprays sold or distributed for at least five years.
Violators face a maximum penalty of a $2,000 fine and/or one year in prison.