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C. Sei-Hee Arii

401 East Jefferson Street
Suite 208
Rockville, MD 20850

Phone: 240-621-0007

Website: ariilaw.com

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About C. Sei-Hee Arii

For over 20 years C. Sei-Hee Arii has successfully litigated criminal, serious traffic (DUI/DWI), and civil cases. From 2013 to 2021, she received AVVO’s Superb 10.0 rating and its Clients’ Choice Award. She has been selected for inclusion in the following lists: Maryland and Washington, D.C. Super Lawyers® (2010-2022) (limited to 5% of Maryland and D.C. lawyers); “Top 100 Trial Lawyers in Maryland” (2010- 2022); “Top 100 Criminal Defense Lawyers in Maryland” (2013- 2022); and Washingtonian Magazine’s Best Lawyers (2011-2012). Arii Law Firm offers quality legal services at a reasonable price.

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NCDD Journal

Find the latest news and announcements in our journal.

FROM OUR BLOG

Oral Fluid Testing: Roadside vs. Evidential Analyses

09/02/2025

Written by Ashely M. Hart As cannabis is being decriminalized in many states, there has been increased interest in rapid roadside tests to detect THC and other substances for intoxicated driving charges. A majority of states now have oral fluid testing in some form: roadside (presumptive) or evidential (confirmed in a lab). These states include Alabama, Alaska, Arkansas, Arizona, California, Connecticut,...

Interview With an Amicus

06/27/2025

Written by Michelle L. Behan Amicus Curiae (Latin for "Friend of the Court") refers to a brief that is filed by an interested, non-party to the matter under consideration. This is often done in cases where organizations and entities wish to provide the reviewing court with their point of view, be it social or public policy implications, or special interest agendas....

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Benefits of NCDD Membership

Members of the NCDD not only demonstrate that they are qualified DUI defense attorneys, but they have access to valuable information and resources. We provide access to documentation blood alcohol testing devices and scientific articles related to alcohol, drugs, driving, and testing.

We offer training on trial techniques and scientific testing, and we provide access to experts and a comprehensive knowledge base of cases and motions. With all of these resources at your fingertips, you will be able to win more cases

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Membership Plans

Depending on your level of experience, we offer multiple plans for NCDD Membership. Attorneys who have been practicing for less than six years are eligible for a New Attorney membership, while those who have been practicing for over six years can receive a Seasoned Attorney membership. We also offer memberships for Public Defenders.