From the DDM Tuning website:
ARE YOUR PRODUCTS DOT APPROVED?
Certain products, including HID Kits and certain headlights which are approved for the European market but vary from the American market parts are for race use only and do not have DOT (Department of Transportation) approval. Any misuse of said product is done so at the buyers own risk, DDM Tuning is not responsible for any complaints, fines, or damages done for driving on public roads with non DOT approved parts.
http://www.ddmtuning.com/Content/General-FAQFrom Zenonlink's conditions of use:
All HID lamps we sale are intended for use solely as auxiliary lighting. All HID lamps are
not intended to be used for headlight purposes, nor are they certified for headlight usage. Lighting laws vary from state to state.
For all lighting modification parts are legal for racing vehicles which may never be used upon a highway. Persons in other states must check their local and state laws regarding use of our products
WWW.XENONLINK.COM will not responsible on any legal issue on using the products.
http://www.xenonlink.com/info/Conditions+of+Use.html?osCsid=11629c7b6db5a99393ad92c61eaeb910