A criminal charge is an allegation. Evidence is what turns it into a conviction, and the absence of evidence is what prevents one.
Most of what determines the outcome of a case happens in the months when lawyers are reading files rather than arguing in court. Here is what that work involves.
What the State Must Give You
Arizona requires broad disclosure, and it starts early.
The State must make its reports available by the preliminary hearing, or by the arraignment where no preliminary hearing is held. Supplemental disclosure follows and covers the names and addresses of witnesses the State intends to call along with their statements, any statement made by you or a co defendant, and the physical evidence in the State’s possession.
Additional obligations attach as trial approaches. The State must provide a list of prior felony convictions for witnesses it intends to call, no later than 30 days before trial in a felony case and 10 days before trial in a misdemeanor. Certain items must be made available for examination and testing within 30 days of a written request.
When disclosure does not arrive, the remedy is a motion to compel, and courts can impose sanctions including preclusion. A case where the defense never received the video is not a case that was fairly resolved.
The Obligation That Goes Further
Separate from the disclosure rules, prosecutors have a constitutional duty to turn over evidence favorable to the accused that is material to guilt or punishment. That includes impeachment material, such as deals offered to witnesses and problems in an officer’s history.
This obligation does not depend on you asking. It is the prosecutor’s affirmative duty, and violations of it are among the most common grounds for overturning convictions nationally.
What You Have To Disclose
Disclosure runs both directions. If the defense intends to present witnesses, opinion testimony, or certain defenses, notice must be given within the timeframes the rules set.
That is why decisions about defense strategy cannot wait until the week of trial, and why the sequence matters, as our guide to what happens at trial describes.
Suppression
Some evidence is real, reliable, and still inadmissible because of how it was obtained.
A motion to suppress asks the court to exclude evidence gathered through an unlawful search, an unlawful stop, or a statement taken in violation of your rights. The hearing is adversarial. Officers testify, your attorney cross examines them, and the judge rules.
Winning one frequently ends a case, because in many prosecutions the seized item or the statement is the case. Our guides to police searches and Miranda cover the grounds that support these motions.
Evidence derived from an unlawful search can be excluded as well, subject to limits including good faith, inevitable discovery, and independent source.
Forensic Evidence Is Not Automatic Truth
Juries treat laboratory results as objective. Lawyers who handle these cases know the picture is more complicated.
Most forensic testing in Arizona cases runs through the Arizona Department of Public Safety Scientific Analysis Bureau, which operates regional crime laboratories in Phoenix, Tucson, Flagstaff, and Lake Havasu City and provides services to police agencies across the state.
Three things about that system matter to a defense.
- The report you receive is not the analysis. DPS uses simplified laboratory reports, meaning the document disclosed is a summary rather than the underlying bench notes, instrument data, calibration records, and quality control results. Those materials exist in the case file and have to be requested. A defense that reads only the summary has not examined the evidence.
- Backlogs are real and published. DPS posts current turnaround data by analysis type. That affects timing, and it sometimes affects whether testing was rushed.
- Instrument records are discoverable. Breath testing in Arizona runs on a specific instrument platform with statewide performance data maintained by DPS. Calibration history, maintenance records, and operator certification are all fair game, and they are frequently where DUI cases are actually won rather than in argument about the number itself.
The same scrutiny applies to field drug tests, which are presumptive rather than confirmatory, and which matter in controlled substance prosecutions.
The Right To Confront the Analyst
A laboratory report is a statement made by a person. Under the Confrontation Clause, the analyst who performed the testing generally must appear and be subject to cross examination rather than having the report simply handed to the jury.
That right is waivable, and it gets waived constantly by inattention. Preserving it is basic defense work.
Evidence That Disappears
- Body worn and dash camera footage sits on retention schedules that vary by agency and can be short.
- Surveillance footage from stores and parking lots is routinely overwritten within days.
- Phone records, cell site data, and social media content require preservation requests directed to the right custodian.
- Witnesses relocate and memories fade.
- Physical evidence gets released, returned, or destroyed.
- Preservation letters are among the first things a defense lawyer sends, and they only work before the material is gone. That is the single strongest argument for involving counsel early rather than waiting for a court date.
Chain of Custody
Every item has a documented path from seizure to courtroom. Gaps in that record, unexplained transfers, and improper storage all create arguments about whether the item tested is the item taken.
These challenges rarely produce exclusion on their own. They routinely affect what a jury believes, and they matter in weapons cases and drug cases where identity of the item is the whole issue.
What You Should Be Doing
- Write down everything you remember now, with dates, while it is accurate.
- Preserve your own materials, including messages, photographs, receipts, and location history.
- Identify witnesses while they are findable and give the names to your lawyer rather than contacting them yourself.
- Do not delete anything. Deletion looks like consciousness of guilt even when it was innocent.
- And do not add to the State’s evidence by discussing the case on a recorded jail line, in a message, or anywhere online.
Talk to an Arizona Criminal Defense Attorney
Cases are won by people who read the whole file rather than the summary. Citrine Law handles criminal defense throughout Yuma County and appears regularly for clients charged near the border. The consultation is free, we work in English and Spanish, and nothing you tell us leaves this office. Call us today.