Most criminal cases in Tempe do not begin with an arrest. Instead, they start with an investigation. Sometimes that investigation moves quickly after a 911 call. Other times, it develops quietly over weeks or even months before law enforcement files charges.
If you believe you are under investigation — or if detectives have contacted you — understanding how criminal investigations begin in Tempe can help you protect your rights and avoid costly mistakes.
At Guardian Law, we represent individuals throughout Tempe and Maricopa County who are under investigation or facing charges for violent crimes, drug offenses, weapons misconduct, robbery, burglary, theft, and white-collar crimes. As a focused criminal defense attorney Arizona firm, we often intervene early in investigations to protect our clients before formal charges are filed.
The Initial Report or Complaint
Most investigations begin with a report. That report may come from:
- A 911 emergency call
- An alleged victim
- A witness
- A traffic stop
- A business audit
- A financial institution
- A probation officer
For example, a reported assault may trigger an investigation under A.R.S. § 13-1203, while suspicious financial activity may lead to a fraud inquiry under A.R.S. § 13-1802.
Once police receive the report, officers document the complaint and determine whether enough information exists to begin a formal investigation.
The Preliminary Investigation Phase
During the early stage, officers gather basic facts. They may:
- Interview the reporting party
- Speak with witnesses
- Collect physical evidence
- Review surveillance footage
- Photograph the scene
- Request medical records
At this point, investigators focus on determining whether probable cause exists. However, probable cause requires more than suspicion. Officers must gather facts that reasonably support the belief that a crime occurred and that a specific person committed it.
In drug investigations under A.R.S. § 13-3407, for example, officers may conduct surveillance or arrange controlled purchases before seeking charges.
Suspect Identification and Interviews
After collecting preliminary evidence, investigators often identify a suspect. Detectives may attempt to contact that individual for an interview.
Importantly, detectives frequently present interviews as informal conversations. They may say they “just want to hear your side of the story.” However, anything you say can become evidence.
If you receive a call from a detective or learn that police want to speak with you, contacting a criminal defense attorney Arizona residents trust before responding can protect you from making statements that prosecutors later use against you.
Early legal intervention often changes the direction of an investigation.
Search Warrants and Evidence Collection
When investigators believe evidence exists in a home, vehicle, phone, or computer, they may seek a search warrant.
To obtain a warrant, officers must submit an affidavit to a judge establishing probable cause. The affidavit must describe:
- The alleged offense
- The evidence sought
- The location to be searched
- The connection between the evidence and the crime
In weapons misconduct investigations under A.R.S. § 13-3102 or burglary cases under A.R.S. § 13-1507, police frequently seek search warrants for residences or digital devices.
If officers provide inaccurate or misleading information in the affidavit, the defense may challenge the warrant later in court.
Grand Jury Proceedings in Felony Cases
In many felony cases, prosecutors present evidence to a grand jury rather than filing charges directly.
The grand jury reviews evidence presented by the prosecutor and decides whether probable cause exists to issue an indictment. The defense does not present evidence during this proceeding.
For serious offenses such as robbery under A.R.S. § 13-1902 or aggravated assault under A.R.S. § 13-1204, grand jury indictments are common.
Once the grand jury returns an indictment, the court typically issues an arrest warrant.
White Collar and Financial Investigations
Not all investigations involve immediate arrests. White-collar investigations often unfold quietly.
In fraud or theft cases, investigators may:
- Subpoena bank records
- Review contracts and invoices
- Analyze email communications
- Interview coworkers
- Work with forensic accountants
These investigations can last months before charges appear. Therefore, if you become aware of a financial inquiry involving your name, seeking legal counsel early can significantly reduce risk.
A strategic white collar crime defense often begins before formal accusations.
What Triggers an Arrest?
An arrest usually occurs when police believe they have established probable cause.
Officers may arrest someone:
- At the scene of an alleged offense
- After obtaining a warrant
- Following a grand jury indictment
- During a traffic stop
- During execution of a search warrant
However, investigators do not always arrest immediately. In some cases, they complete the investigation first and submit charges later.
Understanding this timeline helps explain why someone may learn about charges weeks or months after an alleged incident.
How Early Legal Representation Can Help
Many people wait until formal charges appear before contacting an attorney. However, early representation can:
- Prevent damaging statements
- Facilitate communication with detectives
- Challenge unlawful searches
- Present mitigating information to prosecutors
- Influence charging decisions
In some situations, proactive legal advocacy can prevent charges altogether.
At Guardian Law, we analyze investigations carefully. We examine probable cause, review warrant procedures, and protect our clients’ constitutional rights from the very beginning.
Common Mistakes During Investigations
Individuals under investigation often make avoidable mistakes, including:
- Speaking to detectives without counsel
- Consenting to searches unnecessarily
- Deleting electronic data
- Contacting alleged victims directly
- Ignoring police contact
Each of these actions can complicate your defense.
Instead, contacting a skilled violent crime lawyer, drug crimes defense attorney, or white-collar defense attorney early can provide guidance tailored to your situation.
Frequently Asked Questions About Criminal Investigations in Tempe
How long do investigations last?
Investigations can last days, weeks, or months, depending on the complexity of the case and the evidence involved.
Can I be charged without being arrested first?
Yes. Prosecutors may seek an indictment and issue an arrest warrant without prior contact.
Should I talk to detectives if I am innocent?
Even innocent statements can be misunderstood. You should consult an attorney before speaking with law enforcement.
Can charges be avoided during an investigation?
In some cases, early legal intervention can influence whether charges are filed or reduce their severity.
Speak With a Tempe Criminal Defense Attorney Today
If you believe you are under criminal investigation in Tempe, do not wait for an arrest to take action. The decisions you make during the investigation stage can shape the entire outcome of your case.
Guardian Law represents individuals throughout Tempe and Maricopa County who are under investigation or facing charges for violent crimes, drug offenses, weapons misconduct, robbery, burglary, theft, and white-collar crimes. We provide strategic analysis, proactive defense, and aggressive advocacy from the earliest stages.
Call Guardian Law today at (602) 888-8020 for a confidential consultation.