According to all the laws I know about, you can do anything you want as long as you are willing to pay the fine and/or do the time.
Using a legal device for an illegal act is still illegal. It is designed for rescue and emergencies and when expired, to be kept in reserve or thrown safely away without discharging.
Good luck, and if it happens to go off "accidently" at said fireworks display, don't let them see your forum posts.
Bountyhunter <img src="/images/graemlins/grin.gif" alt="" /> <img src="/images/graemlins/wink.gif" alt="" /> <img src="/images/graemlins/cool.gif" alt="" />