1. What is Forensic Linguistics

• Core Concept
  • 1.1 What is forensic linguistics?
    • Forensic linguistics is the application of linguistic knowledge, methods, and theory to legal contexts-anything from a disputed confession to a ransom note, a trademark dispute, or courtroom testimony itself.¹
  • 1.1.1 What does “forensic” actually mean?
    • The word forensic doesn’t mean “crime lab.”
    • It comes from the Latin forensis, meaning “of the forum”-the place where legal arguments were made.
  • 1.1.2 So what is forensic linguistics, at its core?
    • At its core, forensic linguistics is language analysis put to work wherever the law needs it.
  • 1.2 Is forensic linguistics just one activity?
    • No. The field usually splits into three broad strands.
  • 1.2.1 What is the first strand?
    • The first is language and the law: how legal language itself functions-for example, the comprehensibility of jury instructions, the wording of contracts, and the structure of Miranda warnings.
  • 1.2.2 What is the second strand?
    • The second is language in the legal process: how language operates inside courtrooms, police interviews, and depositions.
    • Typical questions include the power dynamics of cross-examination, the phrasing of leading questions, and interpreter accuracy.
  • 1.2.3 What is the third strand?
    • The third-and the one most people picture when they hear “forensic linguist”-is language as evidence.
  • 1.2.3.1 What kinds of questions does “language as evidence” try to answer?
    • It analyzes a text or recording to answer factual questions, most often:
      • Who wrote this?
      • Who said this?
      • What did this text actually mean?
  • 1.3 What assumption does the “language as evidence” strand rely on?
    • It rests on a working assumption worth naming early because you’ll return to it constantly.
    • Every speaker and writer has an idiolect.
  • 1.3.1 What is an idiolect?
    • An idiolect is an individual’s somewhat stable pattern of linguistic habits.²
    • These habits include preferred words, syntactic quirks, punctuation habits, spelling errors, and many other recurring features.
  • 1.3.2 Why does an idiolect matter?
    • In aggregate, these linguistic habits can distinguish one language user from another.
  • 1.3.3 Is an idiolect the same as a fingerprint or DNA?
    • No.
    • This is not the same claim as a fingerprint or DNA match.
  • 1.3.3.1 What’s the difference?
    • An idiolect is probabilistic, not unique in any provable mathematical sense.
    • That distinction will matter enormously once you get to admissibility and courtroom testimony later in this course.
  • 1.4 Is forensic linguistics an old field?
    • No. The field is relatively young.
    • It didn’t exist as a named discipline until the second half of the twentieth century.³
  • 1.4.1 How did the field develop?
    • It grew directly out of casework, not theory.
    • Linguists were pulled into real disputes and had to build methodology as they went.
  • 1.4.2 Why is that history important?
    • That origin story matters pedagogically.
    • Forensic linguistics has always been applied first and theorized second.
  • 1.4.3 How will that affect this course?
    • As you go through this course, you’ll notice that most lessons start from a case, not a formula.
    • That’s not a stylistic choice-it’s how the field itself developed.
  • 1.5 What’s the one caution to remember from Lesson 1?
    • Forensic linguistics is a tool for building an argument about probability, not a machine for producing certainty.
  • 1.5.1 What does that mean in practice?
    • Every technique you’ll learn-stylometry, dialect placement, discourse analysis, and others-produces evidence to be weighed, not verdicts to be handed down.
  • 1.5.2 Why is that distinction so important?
    • Keep that distinction close.
    • It’s the difference between good forensic linguistics and bad forensic linguistics, and it recurs in nearly every case this course will study.
• Real-World Case: The Evans Statements (1968)
  • 1.6 Where does the term “forensic linguistics” come from?
    • It’s usually traced to Swedish linguist Jan Svartvik, who in 1968 published The Evans Statements: A Case for Forensic Linguistics.⁴
  • 1.6.1 What was the underlying case?
    • Timothy Evans was convicted and executed in 1950 for the murder of his wife and daughter in Britain.
    • His neighbor, John Christie, was later revealed to be a serial killer who had in fact committed the murders. Evans received a posthumous pardon in 1966.
  • 1.6.2 What did Svartvik’s linguistic analysis actually show?
    • He examined the written statements police attributed to Evans and found portions were linguistically inconsistent with each other-some sections showed markedly different sentence patterns and register than others.
    • This suggested the “verbatim” police record wasn’t a faithful transcription of Evans’s actual speech.
  • 1.6.3 Why does this case matter as a starting point for the field?
    • It wasn’t about catching a liar through clever wordplay.
    • It was about demonstrating, with textual evidence, that an official document didn’t say what it claimed to be-a plain, procedural use of linguistic analysis that helped correct a wrongful execution.¹

Key Terms

• Forensic linguistics - the application of linguistic theory and method to legal questions and contexts.
• Idiolect - an individual’s distinctive, relatively stable pattern of language use.
• Language as evidence - the strand of forensic linguistics that analyzes texts or speech to answer a factual question in a legal dispute.
• Register - the variety of language used in a particular social setting or for a particular purpose (e.g., formal police statement vs. casual speech).
• Admissibility - whether a court will accept a given piece of expert evidence or testimony under the applicable legal standard.

Try It Yourself

• Pull up two pieces of your own writing from very different contexts-say, a text message to a friend and a work email. Without editing either one, compare them side by side and list five concrete linguistic differences (not just tone-look at sentence length, contractions, punctuation habits, filler words, how you open and close).
• Then ask yourself: if someone anonymized both texts and handed them to a stranger, how confident would that stranger be that the same person wrote both? What would give you away? What would mask you? Keep this list-you’ll use similar thinking again once we reach stylometry in Lesson 4.

Further Reading