When fraudsters coordinate schemes across multiple parties, they leave behind a record in their phone data that financial transactions alone cannot replicate: who called whom, when, how often, and from where. That communication trail, when properly analyzed, can expose the premeditation, coordination, and relationships that make a fraud case prosecutable.
The scale of multi-party fraud makes this work urgent. According to the ACFE's 2024 Report to the Nations, 54% of occupational fraud cases involved more than one perpetrator — and schemes with three or more conspirators produced median losses of $329,000, compared to $75,000 for single-actor fraud. Where there are multiple perpetrators, there are almost always communications between them.
This guide explains how call pattern analysis works, what investigators look for, and how certified examiners turn raw phone records into court-ready evidence.
TL;DR
- 54% of fraud cases involve multiple perpetrators — coordinated schemes leave communication trails that forensic analysts can recover and map
- Call Detail Records (CDRs) capture who called whom, when, for how long, and from where, all without requiring access to the actual call content
- Red flags include pre-event communication spikes, hub-and-spoke networks, and cell tower data that contradicts a subject's stated location
- The analysis follows six stages: scoping, records acquisition, network mapping, pattern analysis, interpretation, and evidence documentation
- CDR evidence is admissible in court when authenticated by certified examiners using validated forensic methodologies
What Is Call Pattern Analysis?
Call pattern analysis is the systematic examination of Call Detail Records to identify suspicious communication relationships between individuals or entities under investigation.
Under FCC regulations (47 CFR Part 64), "call detail information" includes the number called or originating number, call time, location, and duration. Carrier CDRs are generated by network switches primarily for billing purposes.
NIST's mobile forensics guidance notes that CDRs can also capture the serving cell tower — enabling geographic placement of a device at the time of each call, a detail that often proves critical in fraud timelines.
Where It's Applied
Call pattern analysis appears across multiple fraud investigation types:
- Insurance fraud — staged accident rings coordinating claims across multiple claimants and providers
- Corporate embezzlement — employees coordinating with external parties to divert funds
- Procurement fraud — vendors and internal managers colluding on contract awards
- Money laundering networks — identifying transaction coordinators through communication patterns
- Organized crime — mapping hierarchies and identifying key actors within criminal enterprises
Two Primary Approaches
In fraud investigations, retrospective CDR analysis is the standard approach — reviewing historical records after a fraud is suspected. A proactive alternative, continuous monitoring, flags unusual communication spikes in real time, but this is less common in civil and criminal fraud investigations. Retrospective analysis is what courts and counsel typically rely on when building an evidentiary record.
Why Call Pattern Analysis Is Critical in Fraud Investigations
Fraud rarely happens in isolation. A single actor can embezzle alone, but the moment a scheme requires a second signature, a complicit vendor, or a coordinated claim, communication becomes necessary. That communication creates evidence.
Call pattern analysis converts raw phone records into structured intelligence that advances investigations in specific, measurable ways:
- Establishes timelines — pinpoints when parties began communicating relative to the fraud event, which is essential for proving intent and premeditation
- Uncovers hidden networks — reveals relationships between individuals who claim not to know each other, a hallmark of organized fraud ring activity
- Corroborates or contradicts alibis — cross-referencing call logs with financial transactions, surveillance, or document submissions can confirm or disprove a subject's account
- Identifies additional suspects — a single CDR can expand an investigation by exposing previously unknown participants
- Supports prosecution — cell phone records qualify as business records under FRE 803(6), and Rule 902(11) certifications allow authentication without live testimony from a carrier representative, as confirmed in United States v. Yeley-Davis, 632 F.3d 673 (10th Cir. 2011)
That investigative reach has direct financial consequences. Multi-perpetrator fraud schemes produce losses nearly four times higher than single-actor cases — which means identifying and proving coordination through communication records directly affects recovery outcomes.
How Call Pattern Analysis Works – Step by Step
Trained fraud examiners follow a structured process. Skipping or rushing any stage — particularly records authentication or network interpretation — is one of the most common mistakes that can compromise a case's legal defensibility.
Step 1 – Define the Investigation Scope
Before requesting any records, investigators must identify:
- The specific fraud allegation and the legal theory being tested
- The time window under examination (typically bracketing the suspected fraud event)
- Known parties of interest — suspects, victims, and associates
A well-scoped investigation keeps analytical effort focused on relevant communications and ensures evidence requests are specific enough to survive legal challenge.
Step 2 – Obtain Call Detail Records
CDRs can be obtained through two primary routes:
Legal compulsion — subpoenas or court orders served on telecommunications carriers under 18 U.S.C. § 2703. Standard subscriber records are available via administrative or grand jury subpoena; historical cell-site location information (CSLI) requires a warrant under Carpenter v. United States (2018), which held CSLI acquisition is a Fourth Amendment search.
Forensic device extraction — using certified tools such as Cellebrite to recover call logs from seized devices, including deleted records. Prudential Associates' examiners hold Cellebrite Certified Operator, Cellebrite Certified Physical Analyst, and GIAC Advanced Smartphone Forensics (GASF) certifications for this work.
Chain of custody documentation begins here. Every acquisition step must be logged to protect evidentiary integrity.
Step 3 – Organize and Map Communication Networks
Once records are obtained, the data is structured into a communication network. Using Social Network Analysis methodology — documented by the FBI as a systematic approach for investigating criminal networks — each individual becomes a node, and each call or message becomes a link weighted by frequency and duration.
The result is a visual relationship map that makes patterns visible that would be invisible in a spreadsheet of raw records.
Step 4 – Apply Pattern Analysis Techniques
Examiners apply four core analytical methods:
- Frequency analysis: how often did two parties communicate over the investigation window?
- Temporal analysis: did call volume spike immediately before or after the fraud event?
- Geographic clustering: do cell tower records place individuals at the same location during key timeframes?
- Anomaly detection: which relationships fall outside the parties' expected professional connections?
Step 5 – Interpret Results and Build the Fraud Timeline
Analytical outputs are translated into a coherent investigative narrative. The communication timeline is laid alongside financial transaction records, document submissions, and surveillance data to show how coordination enabled the fraud. Calls occurring immediately before suspicious transactions or claim filings are flagged as high-priority evidence.
The result is a chronological account that connects communication behavior directly to fraudulent acts — the kind of structured narrative that holds up under cross-examination.
Step 6 – Document and Present Evidence
The final output is a forensically sound report including:
- Authenticated CDR records with proper chain of custody documentation
- Methodology used for acquisition and analysis
- Visual network diagrams suitable for courtroom presentation
- Clear, jargon-free findings accessible to judges and juries
Prudential Associates' CDR analysis reports are built to this standard — designed for legal defensibility from the first page, not retrofitted for court use after the fact.
Key Red Flags: What Suspicious Call Patterns Reveal
Experienced investigators know which patterns warrant attention. No single flag is conclusive, but each one — corroborated by other evidence — can be decisive in court or at the claims table.
Sudden communication spikes A sharp increase in call frequency between two parties in the days or hours before a claim filing, contract award, or financial transaction signals deliberate coordination. The timing matters as much as the volume.
Contradictory relationship claims Subjects who claim no prior relationship but whose CDRs show dozens of calls over months directly contradict their own statements. That inconsistency, documented and authenticated, can be decisive in court.
Hub-and-spoke networks One central number connected to multiple otherwise-unrelated participants is a classic signature of organized fraud rings — including staged accident schemes and vendor kickback conspiracies. FBI Social Network Analysis methodology specifically identifies hub actors as key targets in criminal network mapping.
Short-duration, high-frequency calls Rapid bursts of brief calls suggest coordination — parties confirming they're proceeding without leaving incriminating content in any single exchange.
Cell-site location contradictions When cell-site location data places a subject far from where they claimed to be during a fraud event, it directly refutes their alibi. In Carpenter v. United States, the government used historical cell-site records to produce maps placing the defendant's phone near the locations of charged offenses — records that became some of the most persuasive evidence in the case. For investigators, CSLI doesn't just suggest location; it anchors a subject to a specific time and place in a format courts readily accept.
Case Walkthrough: Procurement Fraud Investigation
This scenario is hypothetical but built on realistic investigative patterns and validated by actual DOJ prosecutions.
The situation: A mid-sized company suspects its procurement manager of colluding with a vendor. Three contracts were awarded well above market rate. Financial records show no obvious kickback trail — no unusual deposits, no undisclosed accounts visible in an initial review.
Initiating CDR Analysis
The company's legal team engages a forensic investigator. CDRs are subpoenaed from the carrier for both the procurement manager and the vendor's primary contact. Records reveal 47 calls over the 60 days prior to the three contract awards — most occurring after business hours. The two parties had no documented professional reason to communicate at that frequency or at those hours.
Cross-Referencing the Evidence
The investigative team does not draw conclusions from call frequency alone. The communication timeline is cross-referenced against:
- Email metadata and timestamps
- Contract submission dates
- Financial transaction records
The calls cluster in two-to-three-day windows immediately preceding each contract award decision — a pattern that frequency alone never would have revealed.
How it converts to action: The corroborated timeline — calls aligned with contract decisions, combined with pricing irregularities — provided sufficient basis to pursue a full forensic audit. That audit documented kickback payments. The CDR evidence didn't close the case — it directed investigators toward the evidence that did.
This mirrors the pattern seen in real DOJ enforcement. In April 2025, former military contractor David Cruz pleaded guilty to deleting text messages with co-conspirators who were separately charged with bid rigging and price fixing on U.S. military construction contracts — a case where communication records were so central to the investigation that destroying them became a criminal act in itself.
How Prudential Associates Can Help
Prudential Associates serves attorneys, corporations, insurers, law enforcement agencies, and government bodies that need call pattern analysis conducted to a standard that holds up in legal proceedings — not just operational intelligence that becomes a liability when cross-examined.
The team includes:
- Certified Fraud Examiners (CFE) who have worked multi-party fraud schemes across financial, insurance, and organized crime cases
- Cellebrite Certified Operators and Physical Analysts who extract and authenticate call records directly from seized mobile devices
- GIAC Advanced Smartphone Forensics (GASF) specialists handling complex device analysis where standard extraction methods fall short
- Cellebrite UFED Physical and Logical Pro certified examiners capable of recovering deleted call logs from seized devices
Every CDR engagement follows strict forensic chain of custody procedures from acquisition through reporting. Each report includes authenticated records, documented methodology, and visual network diagrams — structured for use in depositions, hearings, and trials.
CEO Jared Stern has testified as a digital forensics expert at the local, state, and federal levels — more than 500 times as a fact witness. That testimony is backed by documented methodology, verified credentials, and a team built from former law enforcement and intelligence professionals.
For organizations that need call pattern analysis integrated with financial forensics, OSINT, or broader digital device examination, Prudential Associates brings all of those capabilities under one engagement. CDR evidence is most effective when it corroborates other findings — and that's precisely how the team builds its cases.
Conclusion
Call pattern analysis transforms coordination that fraudsters assume is invisible into structured, court-ready evidence. Properly executed, it reveals timing, intent, and relationships that financial records alone cannot establish — expanding the scope of an investigation and reinforcing every forensic stream it touches. Authenticated by certified examiners, it holds up under legal scrutiny.
The critical qualification is that it must be done right. These are not optional enhancements — they are the foundation of defensible findings:
- Certified professionals with documented examiner credentials
- Validated methodologies applied consistently throughout the analysis
- Unbroken chain of custody from data acquisition to court presentation
- Integration with financial forensics, digital device examination, and open-source intelligence
Without these elements, analysis that appears compelling in a report may not survive a challenge in court.
Frequently Asked Questions
How do you identify fraud patterns?
Fraud patterns emerge by cross-analyzing behavioral, financial, and communication data for anomalies — unusual call frequency, atypical transaction timing, or unexpected relationships between parties — that deviate from a baseline of normal activity. When multiple data streams point to the same anomaly, that convergence warrants formal investigation.
What is the 10-80-10 rule for fraud?
The 10-80-10 rule is a fraud training heuristic suggesting 10% of people will never commit fraud, 80% might under the right circumstances, and 10% will always seek an opportunity. It guides where preventive and detective controls should be focused, though no verified primary research source has been established for it.
What are the 4 P's of fraud?
No authoritative primary source has established the 4 P's as a standard model. The recognized frameworks are the Fraud Triangle (pressure, opportunity, rationalization — Dr. Donald Cressey) and the Fraud Diamond, which adds capability as a fourth element per Wolfe and Hermanson (2004).
What is a Call Detail Record (CDR) and how is it used in fraud investigations?
A CDR is a data record generated by a telecommunications carrier that logs metadata about each call — including originating and destination numbers, timestamps, duration, and cell tower location. Investigators use CDRs to map communication patterns and relationships between suspects without requiring access to the actual content of calls.
How are call records legally obtained for a fraud investigation?
CDRs can be obtained via subpoena or court order directed at the carrier under 18 U.S.C. § 2703, or through forensic extraction from a seized device using certified tools. Historical cell-site location information specifically requires a warrant following Carpenter v. United States.
Can deleted call logs be recovered and used as evidence?
Deleted call logs can often be recovered through forensic extraction — tools like Cellebrite access records stored in SQLite databases that are invisible to the phone's operating system. Recoverability depends on the device and whether data has been overwritten. Records extracted by a certified examiner with proper chain of custody documentation are admissible in legal proceedings.
