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Leonard D. Harden

About me

I am an experienced trial lawyer practicing in Northern New Hampshire, primarily serving Coos, Carrol and Grafton County. I have successfully argued more jury trials than any other defense lawyer in Coos County. I have been representing people in criminal cases for over twenty years.

I am recognized by my peers as possessing exceptional knowledge in the field of DWI. I have served on an editorial board for James Publishing, Inc. and written a chapter on breath testing in a book to be published by Massachusetts Continuing Legal Education, Inc. (MCLE) focusing on New Hampshire DWI defense. I have been a presenter and chair person of New Hampshire defense lawyer trainings sponsored by the New Hampshire Association of Criminal Defense Lawyers Association on Advanced DWI Defense.

I am certified according to the National Highway Traffic Safety Administration (NHTSA) to administer the standardized field sobriety tests (horizontal gaze nystagmus, walk and turn, and one leg stand.) I am also certified to operate, maintain and repair the Intoxilyzer 5000. I have been certified to operate the Intoxilyzer 8000, the SD-5 and Intoximeter FST and taken advanced forensic blood classes. I am a member of the American Academy of Forensic Sciences. I am better trained than the police officer who arrested you. I have the experience to focus on the proper methods to attack the state's case against you and win.

I am available 24 hours a day for emergency consultations.

Harden Law Offices was established in June of 2003. I opened a second office in the summer of 2005 in Littleton to better serve the North Country. In the fall of 2011, I also acquired a Lebanon office.  I am willing to meet with clients before or after normal business hours. I take pride in returning calls personally and in handling all of my cases from start to finish.

I have been focusing on criminal defense with a larger firm from southern New Hampshire and managing their office in Lancaster for over 7 years. Prior to my work with the southern firm, I worked in a North Country general practice firm focusing on criminal defense. It was during my time at the general practice firm that I began taking court appointed cases from local courts in northern New Hampshire.

I have been defending cases in northern New Hampshire for over 20years.

Previous Employment Summary

  • Harden Law Offices, Sole Practitioner, Self employed 2003 to present

  • NH Technical College, Berlin Campus, Professor of Criminal Law 2003 to 2006

  • Twomey & Sisti, Managing Attorney Lancaster Office1996 to 2003

  • Thomas A. Rappa, Jr., Associate Attorney 1993 to 1996

Activities and Awards

  • New Hampshire Criminal Defense Lawyers Association Board of Directors

  • Score of 10, the highest permitted according to a proprietary scoring system established by Naymz based on peer reviews and connections

  • Certified to maintain and repair Intoxilyzer 5000

  • Certified operator of evidential breath testing devises.

  • Certified to operate Intoxilyzer 8000

  • Qualified to defend forensic blood cases.

  • Graduate of National College of DUI Defense Summer Session (2005, 2006, 2007, 2008, 2009)

  • National Highway Traffic Safety Administration / International Association of Chief of Police Certified Practitioner of Field Sobriety Testing


Photos and videos

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Practice areas


  1. DUI & DWI: 80%
    6 years
  2. Criminal Defense: 20%
    6 years



Fixed (always)

Payment types:

Cash, Check, Credit card

Attorney endorsements

27 total 

Are you an attorney? Endorse this lawyer

  • Christopher Hunter Cessna

    I am very happy to endorse Len Harden as a true expert and attorney in DUI defense. Unfortunately, what many people facing a DUI don’t know is that there are literally hundreds of attorneys in any metro area who will handle their DUI. However, maybe only a handful of these attorneys truly know how to defend these complex scientific cases. If you submitted to a blood test, breath test or even standardized field sobriety tests, then you need an attorney who has years of formal training and experience defending these complex cases. Hiring anyone else is usually a recipe for losing. I have known Len for about seven years, and I can assure you he is one of those few attorneys who has a complete understanding of the science necessary to challenge these cases successfully. If I ever needed to refer someone to the best DUI attorney in New Hampshire, I would only refer them to Len Harden. Christopher H. Cessna Attorney at Law Denver, CO


    Christopher Cessna DUI and DWI Attorney
    Relationship: Worked together on matter

  • Mark L. Stevens

    I have known Len Harden for years and I've had the chance to watch him in court first hand. He is an outstanding DWI champion. I refer clients who get arrested for any crime in the North Country to Len Harden without reservation. There is no need to call any one else for DWI defense in the North Country.


    Mark Stevens DUI and DWI Attorney
    Relationship: Fellow lawyer in community

Contact info

Harden Law Offices

104 Main Street, Suite #3
Lancaster, NH, 03584

Harden Law Offices

15 Main Street
Littleton, NH, 03561

Harden Law Offices

199 Heater Road
Lebanon, NH, 03766



NHAuthorized to practice law199404/20/2010
We have not found any instances of professional misconduct for this lawyer.
Avvo contributions
Legal answers
Award nameGrantorDate granted
2013 FST NHTSA CertificateCorroto Enterprises, LLC2015
Key West Legal SeminarNORML2013
DU Defense Summer Session, Graduate, Harvard Law SchoolNational College for DUI Defense2013
Key West Legal SeminarNORML2012
Mastering Scientific Evidence In DWI/DUI CasesNational College for DUI Defense and Texas Criminal Defense Lawyers Association2011
DWI Detection& Standardized Field Sobriety Testing InstructorImpaired Driving Specialists, LLC2010
Mastering Scientific Evidence DWI/ DUI CasesNational College for DUI Defense and Texas CDLA2010
DUI Defense Summer Session, Graduate, Harvard Law SchoolNational College for DUI Defense2009
Forensic Blood and Urine TestingMD Marketing, Inc.2009
Evidential Breath Alcohol TechnicianIndustrial Training & Design Ltd2009
Intoxilyzer 8000 Operator's CourseMD Marketing, Inc.2008
DUI Defense Summer Session, Graduate, Harvard Law SchoolNational College for DUI Defense2008
DUI Defense Summer Session, Graduate, Harvard Law SchoolNational College for DUI Defense2007
Mastering Scientific EvidenceNational College for DUI Defense and Texas CDLA2007
DUI Defense Summer Session, Graduate, Harvard Law SchoolNational College for DUI Defense2006
Evidential Breath Alcohol TechnicianIndustrial Training & Design Ltd2006
DUI Defense Summer Session, Graduate, Harvard Law SchoolNational College for DUI Defense2005
NHTSA/US DOT Standard Field Sobriety Testing PractitionerWalden, Platt and Associates2005
Maintenance and Repair on Intoxilyzer 5000C.E.S. Consulting, Inc.2005
Public Interest Law AwardFranklin Pierce Law Center1993
Work experience
TitleCompany nameDuration
DWI & Criminal Defense AttorneyHarden Law Offices2003 - Present
N/ATwomey & Sisti1997 - 2003
N/AThomas A. Rappa, Jr.1994 - 1997
Association namePosition nameDuration
New Hampshire Association of Criminal Defense LawyersBoard of Directors2010 - Present
American Academy of Forensic SciencesAssociate Member2005 - Present
National College of DUI DefenseGeneral Member2003 - Present
National Association of Criminal Defense LawyersAssociate Member2003 - Present
New Hampshire Association of Criminal Defense LawyersAttorney Member1998 - Present
Coos County Bar AssociationPast Vice President1996 - Present
New Hampshire Bar AssociationAttorney Member1994 - Present
Grafton County Bar AssociationPast Vice President1994 - Present
New Hampshire Bar AssociationBoard of Governors2002 - 2004
Legal cases
Case nameOutcome
State v. William T.Not Guilty after jury trial
State v. Meghan S.Not Guilty after jury trial
State v. Richard C.Not Guilty after a bench trial
See all legal cases 
Publication nameTitleDate
James Publishing publicationRelentless Criminal Cross Examination2008
School nameMajorDegreeGraduated
Franklin Pierce Law CenterN/AN/A1993
Queen's University at Kingston OntarioN/AN/A1990
Speaking engagements
Conference nameTitleDate
Advanced DWIPreparing a Blood Test Case for Court2015
Advanced DWIGC-MS For Lawyers2015
Advanced DWI SeminarCross Examining Officer2012
Advanced DWI DefenseBreath Testing2011
Practical Skills FSTPractical Training in Field Sobriety Testing2010
Forensic ScienceUnderstanding GC Blood testing2010
Strategies in Defending DWI and DUI Cases in New HampshireBreath Testing2008

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