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About Me

Casey J. Mulligan has focused on the defense of persons charged with DUI and other criminal charges for his entire 18-year career.  Casey is a member of the National College of DUI Defense, and is the co-chair of the Criminal Law Section of the Boulder County Bar Association.


Practice Areas


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

Attorney Endorsements

2 total 

  • Michael S. Waddington

    I endorse Casey. He is a highly skilled attorney that is well respected in the legal community.


    Michael Waddington Military Law Attorney
    Relationship: Fellow lawyer in community

  • Brendan Michael Kelly

    I worked with Casey Mulligan on a number of criminal matters when I had an active practice in Colorado. He would be the first person I would call if I was in trouble. He not only is an expert in criminal law but he comes from a background on zealous criminal lawyers. You won't be disappointed if he represents you in Court or a University appeal board.


    Brendan Kelly Criminal Defense Attorney
    Relationship: Worked together on matter

Contact Info

Mulligan & Mulligan, PLLC

4410 Arapahoe Avenue
Suite 140
Boulder, CO, 80303-1155



Professional Misconduct

We have not found any instances of professional misconduct for this lawyer.
Avvo Contributions
Legal Answers
Association NamePosition NameDuration
Boulder County Bar FoundationFellow2010 - Present
National College of DUI DefenseMember2010 - Present
Boulder County Bar Association, Criminal Law SectionCo-chair2009 - 2009
Colorado Bar AssociationMemberN/A
Colorado Criminal Defense BarMemberN/A
Boulder Criminal Defense BarMemberN/A
Legal Cases
Case NameOutcome
People v. Kazmierski & KnaflaEvidence suppressed, all charges dismissed
People v. R. DotsonEvidence suppressed; first degree murder dismissed
People v. A. Handy, 99CR782Case dismissed.
See all Legal Cases 
School NameMajorDegreeGraduated
University of Colorado School of LawLawJD - Juris Doctor1992
University of ColoradoN/ABA - Bachelor of Arts1989