As with all things in the goverment it has to be a proven technology to work... Being in Oz i don't many of the problems you guys have in USA. We have a simple no un-authorized modifacation policy unless you have permits. But being as i believe that all your states have different rules and regs for roads i would just call them and be specific. Also as there is no industry standard for safety on the units there can not be a single rule. eg a Glass jar setup would be extremly dangerous in a car but i am sure a well made cell with safety features that are far beyond what is considered industry standard for the containment, transportation and use of combustible gases would need special permits but would be a lot safer.

@crazyewok
better look up the WA government in Australia, thyey forced a hydrogen boost company out of business as the unit could not do as it claimed. They also put out a warning to any company that comes into existance in the future. However for the homebrew people all is ok still.
I also believe any booster using KOH or any other high alkaline material is illegal in California. However I have not read the legislation.
Mark

MD,
Yup i know of that company... i had a looking into their gear. Their marketing scheme was about increasing fuel economy by a base of 50% on any vehicle they equipped their cell on. Their cells wern't all that heat resistant (in WA heat inside a V8 engine bad in summer here can easily get over 120 deg C his cells would not handle that sort of heat well) and they did not ever do as they claim. Your talking about 1 lpm and worked on the basis of the H2 increasing the combustion speed of the fuel mix to better fuel economy... Pity he had no constraints on what cars he equipped them on and put dangerous mods on cars to trick the sensors. (ever seen what happens when someone with an O2 sensor extender turns their cell off and runs their car... lets say not pretty). Also his claims didn't stand up too well when tested by "experts". He stuffed up by being greedy. The next person to try it will need to pretty much be able to prove his cell in the first week to the MIB and every other department that they think they can get to put a red mark against it...

according to GA emmissions so long as the computer says everything is running fine and your emmissions are good and theres no questionable exaust mods (such as holes in the tail pipe) your good to go. they dont seem to care if your running hho or not.

moral of the story, speak to your local emissions tech and see what matters if you want get a second opinion. chances are they have seen the hho already.