Arizona's Only Certified CRIMINAL DEFENSE TEAM

Losing Your Freedom Is Not an Option

Reputation for Excellence

Top-Notch Criminal Defense

Tucson Criminal Defense Lawyer

Award-Winning Criminal Defense Team in AZ

We Will Fight to Protect Your Future

Arrested or under investigation? Turn to Arizona’s award-winning defense team, Nesci & St. Louis. Our firm represents clients accused of crimes and those under investigation throughout Arizona. Our team of Tucson criminal defense lawyers are committed to obtaining the best results possible for you.

We will file motions challenging the government’s case on every factual and legal issue, and we regularly obtain the dismissal of charges for our clients prior to trial. If your case cannot be dismissed prior to trial, we are not afraid of going to trial and have successfully handled cases involving charges that include:

  • DUI - DUI stands for “Driving Under the Influence,” referring to the act of operating a motor vehicle while impaired by alcohol or drugs. In Arizona, it is a criminal offense and is considered a serious traffic violation.
  • DUI Drugs - DUI drugs, also known as "Drug-Related DUI" or "DUID," refers to the act of operating a motor vehicle while impaired by drugs.
  • DUI Homicide & DUI Manslaughter - "DUI causing death," also known as "vehicular manslaughter while intoxicated," refers to a criminal offense where a person causes the death of another individual as a result of driving under the influence of alcohol or drugs.
  • Domestic Violence - Domestic violence refers to a pattern of abusive behaviors, whether physical, emotional, psychological, or sexual, that occur within a domestic or intimate relationship.
  • Aggravated Assault and Misdemeanor Assault - Assault is a term used to describe a criminal offense involving the intentional act of causing apprehension or fear of immediate harmful or offensive contact in another person, or the intentional act of physically striking, hitting, or attacking someone.
  • Sex Offenses - ex crimes, also known as sexual offenses or sexual crimes, refer to a broad category of criminal acts that involve non-consensual sexual activity, sexual exploitation, or the violation of someone's sexual autonomy and bodily integrity.
  • Computer Crimes - Cybercrimes, also known as computer crimes or cyber offenses, are criminal activities that are committed using computers, networks, or the internet.
  • Drug Offenses - Drug crimes, also referred to as drug offenses or narcotics offenses, are criminal activities related to the production, distribution, possession, or use of illegal drugs.
  • All Felony DUI matters - including DUI Aggravated Assault, Endangerment and Criminal Damage

Focused Criminal Defense Lawyers in Tucson

Protecting the Rights of those Accused by the Government

While other firms dilute their resources by attempting to handle multiple areas of law, Nesci & St. Louis is exclusively focused on defending the criminally accused. By concentrating solely on criminal cases, we are able to devote the time and resources necessary to obtain a deep understanding of the legal and factual issues facing those accused of a crime.

In fact, our Tucson criminal defense attorneys are sought-after speakers nationally, regularly training defense lawyers across the Country on how to handle a criminal case. This allows us to provide the very best representation possible. In criminal cases, time is of the essence. Act now to ensure that no evidence necessary to your defense is lost.

Here are several benefits of hiring our Tucson criminal defense attorneys to defend you:

  • Our team has more than four decades of combined legal experience and comprehensive knowledge of state and federal criminal law
  • We can guide you through the complexities of the criminal justice system while protecting your rights and best interests from start to finish
  • Our Tucson criminal defense lawyers can gather evidence and work with expert witnesses to develop a strong and personalized defense strategy for your case
  • We can negotiate a favorable plea agreement to help you avoid harsh penalties, including jail or prison time
  • Our Tucson criminal defense attorneys will fight for you in the courtroom

Contact Nesci & St. Louis online or call (520) 999-2441 to request a FREE case evaluation with a Tucson criminal defense lawyer today. We are here to defend your rights in state and federal criminal matters

Meet Your Award-Winning Team

Over 40 Years of Combined Experience

A National Leader In the Legal Field

A two-time national top 10 speaker of the year (National Association of Criminal Defense Lawyers, 2015 & 2019), Joe St. Louis has given over 150 presentations for State Defense Organizations and State Bar Groups in 19 states. (See the full list here). Need to make this a link to my Seminars & Lectures page, please. He has served on the faculty of the National College for DUI Defense’s Serious Science seminars, held in Arlington, Texas, since 2016, a seminar recommended as an “excellent training course” by the University of Indiana, Bloomington. Mr St. Louis serves as a Regent of the National College for DUI Defense, a national organization with over 1,600 members, and is the Past President of Arizona Attorneys for Criminal Justice.

Criminal Defense Lawyer Near Me

Representing Clients Throughout Arizona

Joseph P. St. Louis has been listed in Woodford & White’s Best Lawyers in America since 2013 and has an AV Preeminent rating from Martindale Hubbell. He has been listed as one of the best lawyers in Arizona by Superlawyers magazine since 2009 and has been listed as one of the best lawyers in Tucson by Tucson Lifestyles magazine since 2013. Joe, who has represented clients at over 200 jury trials, is certified as a specialist in both Criminal Defense (by the State Bar of Arizona) and in DUI Defense (by the National College for DUI Defense (NCDD), a certification recognized by the American Bar Association). Joe is one of 11 members of the Board of Regents, the governing body of the National College for DUI Defense, a nation-wide organization with over 1,600 members. He is also the former President of Arizona Attorneys for Criminal Justice, a statewide defense organization with over 400 members.

Ryan Huffman Ryan set an office record for the most trial wins in the shortest period of time by winning three DUI trials in a row in an eight-week period – not guilty verdicts across the board in all three trials, which included a reported blood alcohol concentration as high as .213. Ryan vigorously represents accused individuals throughout all stages of litigation, including trials and appeals. His experience includes both misdemeanor and felony criminal matters. He focuses on a pretrial motion practice, seeking to have his clients’ cases dismissed prior to trial, and is passionate about advocating against unethical police tactics and procedures. Not afraid to take a case to trial, after demonstrating issues with the way in which the case was charged, Ryan negotiated a plea to probation in the middle of a trial in which his client was facing life in prison

Joseph A. Bonasera is a litigator specializing in Criminal and DUI offenses who has spent his entire legal career representing the criminally accused. Joe’s victories for his clients range from winning a jury acquittal on a sexual assault charge to negotiating the dismissal of charges ranging from DUI to Aggravated Assault. In one case, he convinced a grand jury to bring no charges against his client, after successfully arguing that the first presentation of the case was racially biased. Joe is fluent in Spanish. Since joining Nesci & St. Louis, Joe has focused on pretrial litigation and trial work in DUIs, misdemeanors, and felonies in courts throughout Arizona.

Premier Criminal Defense and 
DUI Defense Attorneys

Our Firm Is Different

Nationwide Leaders in Criminal Defense
  • National Leaders in the Field of Criminal Defense
  • An Attorney Certified in Both Criminal Law and DUI Defense in Arizona
  • Aggressive Representation Delivered Every Time
  • Exclusively Focusing on DUI, and Criminal Defense Law
  • Backed by Over Forty Years of Combined Experience

Contact Nesci & St. Louis Today

Time Is of the Essence - Get In Touch Now
  • Please enter your first name.
  • Please enter your last name.
  • Please enter your phone number.
    This isn't a valid phone number.
  • Please enter your email address.
    This isn't a valid email address.
  • Please make a selection.
  • Please enter a message.


Hear It from Our Clients
  • “I had a great experience with Ryan Huffman. He was friendly, knowledgeable, organized, and always on top of my case. I felt very secure in his ability to handle the case throughout, and the outcome ...”

    - C.P.
  • “I highly recommend Nesci & St. Louis to anyone who is searching for a knowledgeable, experienced, and assertive attorney. Mr. Joe St. Louis worked extremely diligently and fought for me to get me the ...”

  • “Joe St Louis recently represented me in a serious matter and obtained the best outcome possible in a very bad situation. Joe was referred to me by a top Phoenix firm, and the referral proved well ...”

  • “I had just been arrested and charged for speeding and an super extreme DUI & thought my life was over. I had hit rock bottom and couldn't find the way up. After talking with Ryan he gave me the true ...”

    - Avvo Review- Former Client
  • “You always hope you'll never need an attorney, but when your life hits rock bottom and just keeps piling on, you need someone who is truly in your corner. Details aside, I did a bit of research online ...”

    - Kimberly M.