Plumbline — Forensic Accounting & Investigations

The numbers always confess.

Corporate fraud hides in the invoices, the vendors, and the expenses no one questions. Plumbline reads the records line by line and shows you exactly where the money went — with proof that holds up in court.

Founded byDiane Lynn
DisciplineForensic accounting & fraud investigation
Digital evidenceVideo & media authentication
Experience30+ years on the ledger
BasedTucson · Phoenix · Nationwide
What we find

Most fraud isn't clever.
It's patient — and it's already in your books.

It looks like an ordinary line item until someone finally reads it closely. These are the schemes we're hired to unwind.

Phantom vendors Inflated invoicing Duplicate payments Kickbacks Expense abuse Ghost payroll Skimming Billing for work never done Vendor collusion Altered video evidence
Practice

Seven ways we get to the truth.

One discipline, applied wherever the evidence leads. Every engagement starts with the records and ends with something you can act on.

01

Forensic Accounting

Reconstructing records, tracing funds, and quantifying loss when the books stop telling the truth.

02

Vendor & Invoice Fraud

Phantom vendors, inflated billing, and kickbacks hidden in accounts payable — matched line by line to work that was actually done.

03

Asset Misappropriation

Skimming, expense abuse, and ghost payroll — the slow theft that rarely shows up in any single entry.

04

Corporate Spend Audits

An independent read of where the money actually goes, before a suspicion turns into a lawsuit.

05

Litigation Support

Clear exhibits, defensible methodology, and expert testimony that holds up under cross-examination.

06

Fraud Risk & Controls

Closing the gaps that let it happen in the first place — so it doesn't happen to you twice.

07

Video & Media Authentication

Examining video, photos, audio, and social media evidence for tampering, delivering sealed social media captures, and testifying to what we find. Details →

Video & Digital Media Authentication

Is the footage real? We can tell the court.

Video, photos, audio, and social media posts now show up in nearly every case — and they're easier to edit than ever. A clip can be trimmed, re-ordered, slowed down, spliced, or generated outright. A screenshot can be staged. A post can be altered after the fact.

Plumbline examines that evidence the way we examine a ledger: line by line, frame by frame, with a documented method. We determine whether a file is what it claims to be, whether it has been altered, and whether it can be trusted — then we put it in a report a judge and jury can follow.

A

Tamper Detection

Identifying edits, cuts, splices, re-encoding, dropped or duplicated frames, and timing changes that show a file has been altered.

B

Metadata & Source Analysis

Reading the data inside the file — creation dates, device information, encoding history — to test whether it matches the story told about it.

C

Social Media Capture & Sealing

We pull social media posts, profiles, comments, messages, and video directly from the source, preserve them forensically, and deliver them sealed — hashed and documented — ready for authentication in court.

D

Social Media Authentication

Authenticating posts, messages, screenshots, profiles, and shared video — including whether content was edited, staged, deleted, or taken out of context.

E

Synthetic & AI Media

Examining whether a video, image, or voice recording was generated or manipulated with AI tools.

F

Chain of Custody

Documenting how evidence was collected, copied, and handled, with hash verification so the file examined is provably the file produced.

What we examine

Surveillance & CCTV Body & dash cam Phone video Photographs Audio recordings Screenshots Social media posts Text & DM threads

Who we work with

Attorneys on both sides, insurers, employers, and individuals who need to know whether a piece of digital evidence can be trusted — before it's used, or after it's been used against them.

Approach

How an investigation runs.

A forensic engagement is a sequence, not a scramble. Everything is documented as if it will be read aloud in court — because it might be.

01

Intake

A confidential conversation about what you're seeing and what you suspect. No commitment, no paper trail on your end.

02

Examine

We pull the records — ledgers, invoices, statements, systems, media files — and read them the way the people who built the scheme hoped no one ever would.

03

Trace

We follow each dollar, file, and frame to its source and document the path with evidence that stands on its own.

04

Report

Findings in plain language, with exhibits a board member, a jury, or a prosecutor can follow without an accounting degree.

05

Testify

When it goes to court, we're there — to explain the findings to a judge and jury, and to defend how we found them.

The Founder

Diane Lynn

Founder & Principal Forensic Accountant

Diane spent more than thirty years in accounting before the work found its edge. The turn came at JD Demolition, where a routine look at the books turned up thousands of dollars in fraudulent invoicing that no one else had caught — bills for work that was never done, approved and paid, quarter after quarter.

Chasing that trail — matching invoices to jobs, jobs to sites, sites to the dates they were supposedly worked — she found the part of accounting she'd been missing her whole career. Not keeping the books. Reading them.

When she finally retired, retirement didn't take. Within months she was restless, certain there were other companies quietly bleeding money to the same tired schemes, with no one looking closely enough to notice.

So she founded Plumbline — to give owners, boards, and counsel someone who would look. Today she leads a team of accountants and investigators who do exactly that.

Fraud isn't clever. It's patient. To catch it, you just have to be more patient than the person who built it. — Diane Lynn
The Team

One name on the door.
A team behind it.

Diane doesn't work alone. Plumbline's other investigators and accountants stay out of the spotlight by design — professionals who've worked both sides of the ledger.

Confidentiality is the whole point of the work. We don't put their faces on a website. We won't put yours on one either.

01Forensic CPAsFinancial reconstruction
02Certified Fraud ExaminersScheme detection
03Former Internal AuditorsControls & risk
04Licensed InvestigatorsField & asset tracing
05Digital Media ExaminersVideo & media authentication
06Data AnalystsAnomaly & pattern review
07AML / CAMS SpecialistsMoney-movement tracing
Representative Matters

What it looks like when it works.

Every engagement is confidential, so details below are anonymized. The patterns are exactly what we're hired to unwind.

Matter A — Construction

The invoices for work that was never done

A contractor's payables had been padded for years with billing for jobs that existed only on paper. We matched every invoice against site records and schedules.

Six-figure recovery · referred to counsel
Matter B — Distribution

The vendor that didn't exist

A phantom supplier had been set up inside the payment system by someone with the access to approve it. We traced the routing back to a single controlling hand.

Scheme documented · referred for prosecution
Matter C — Professional Services

The expenses that never added up

Executive reimbursements that outran any plausible business purpose, spread thin across enough categories to avoid a second look — until someone took one.

Loss quantified · settled before trial

Representative matters are composites drawn from real engagement types and anonymized to protect client confidentiality. Outcomes are illustrative and not a prediction or guarantee of results in any specific matter.

Contact

Something doesn't add up. Let's find out why.

Every conversation starts confidential and stays that way. Tell us what you're seeing — no engagement, no obligation.

ServingTucson · Phoenix · Nationwide
HoursBy appointment — discretion assured

Confidential intake · never shared

Thank you — your note is on its way to Diane's desk. We'll be in touch.