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Peter was admitted to the Montana State Bar in 2006, the U.S. District Court in 2006, the Ninth Circuit Court of Appeals in 2008 and the United States Supreme Court in 2013.
Peter is a shareholder at McFarland Molloy Lacny & Duerk. Peter has obtained acquittals for accused clients in both state and federal courts. He has handled appeals to the Montana and United States Supreme Courts, and has argued in front of the Ninth Circuit Court of Appeals.
Peter’s practice areas include white collar criminal defense, general criminal defense, personal injury law and general civil litigation.
In addition to his court room work, Peter has represented numerous professionals—including attorneys, nurses, doctors and law enforcement— facing disciplinary action from their licensing boards.
Peter has also represented numerous college students facing expulsion for violating university student conduct codes.
Peter is a proud and active member of the District of Montana’s federal Criminal Justice Act Panel. During law school, he was trained at and tried cases for the Colorado Public Defender’s Office and worked in the law school’s criminal defense clinic.
Peter is recognized statewide as an expert in federal and state firearm laws, on which he regularly lectures and consults with other attorneys.
2
Practice Areas
19 years
19 years
Free Consultation
$0 first 60 minutes
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Chat withState: Montana
Acquired: 2006
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283 West Front Street, Suite 203, Missoula, MT, 59802
Showing 1 - 5 of 11 client reviews from Avvo
Posted by anonymous | December 2, 2020 | Hired Attorney
Several years ago, while an investor in medical marijuana, our facilities were raided and several associates were indicted, facing up to a decade in prison. When the Judge kindly gave our "drug cartel conspiracy" no prison time, the US Attorney decided to challenge that by indicting me for fraud in m...
Posted by Brian | June 21, 2016 | Hired Attorney
After our first conversation about my case, Peter showed a tenacity and work ethic that I am incredibly grateful for. Peter was recommended to me through another law firm and I am so glad that he was. Peter kept in constant contact with me, through whatever means necessary, over the year and a half l...
Posted by John | December 1, 2015 | Hired Attorney
From start to finish, Mr. Lacny was professional, diligent and secured a great result for me. He returned calls promptly, kept me in the loop with emails and made me feel like I was important and that my case mattered. I would highly recommend him to anyone that needs an attorney.
Posted by Benjamin | September 11, 2015 | Hired Attorney
Peter is a fantastic Lawyer. He was very professional and knowledgeable when handling my case. He really cares about his work and clients and was quickly available when needed and always able to answer any questions that I had. It was great having him by my side through such a difficult time ...
Posted by Joseph | September 8, 2015 | Hired Attorney
Peter, has been helpful to me throughout the years. Whether the issue revolved around simple business advise or the unfortunate time (s) I needed his representation for a legal matter. Peter is bright, scholarly in legal matters and his ambitions are only superseced by his desire to put your interest...
2025
Best Lawyers: Criminal Defense White Collar, Best Lawyers
2024
Super Lawyer, SuperLawyers
2007
Vern Klingman Meritorious Act Award, ACLU of Montana
2025 - Present
Shareholder, McFarland Molloy Lacny & Duerk
2007 - 2025
Partner, Datsopoulos, MacDonald & Lind, P.C.
2005 - 2005
Legal Intern, Colorado Public Defender Office
2014 - Present
Federal Bar AssociationMember
2007 - Present
Montana Trial Lawyers AssociationMember
2005 - Present
National Association of Criminal Defense LawyersMember
2017 - 2019
Montana Association of Criminal Defense LawyersPresident
2006
JD - Juris Doctor, With Honors
2002
BA - Bachelor of Arts
2015
Closing Argument Techniques
2013
Evidence Rules in Montana
2012
What Civil Lawyers Need to Know about the Criminal Process.
2010
Federal Firearm Laws
English