A woman tells you her partner choked her. Her voice is hoarse. She has no marks on her neck. He says she is exaggerating, and she is already wavering.

Many agencies treat that call as a misdemeanor domestic with a note in the report. It is one of the most dangerous calls an officer will take all year.

Strangulation Is a Lethality Marker, Not a Minor Assault

Research on intimate partner homicide has repeatedly flagged prior nonfatal strangulation as a major risk factor. Glass and colleagues (2008) found that victims of nonfatal strangulation were roughly seven times more likely to later become victims of completed homicide. Strangulation is rarely the end of the pattern. It is a warning that the offender has crossed a line and knows how.

If your department logs it as simple battery, the case is under-charged and the risk is under-recognized.

The Evidence Problem

Strangulation is hard to prove because it so often leaves nothing to see. Strack and McClane (2001) found that 62 percent of the victims in their study had no visible injury. When injuries are present, they can be subtle, and some do not appear for hours or days.

The weight of the case lands on the investigation:

• Recognizing the symptoms a victim describes, including voice changes, difficulty swallowing, loss of consciousness, and loss of bladder control
• Asking questions that surface what the victim experienced without leading her
• Photographing now, then arranging timed follow-up photography as bruising develops
• Connecting the medical evaluation to the criminal case

If the responding officer does not know what to look for and what to ask, the evidence is gone before the detective opens the file.

Why Cases Built on the Victim Alone Fall Apart

Strangulation victims recant, minimize, and stop answering the phone at high rates. Fear and coercive control explain part of it. The assault itself can also affect how a victim recalls and describes what happened, which means a disjointed account can read as a lie to an officer who has not been taught otherwise.

Cases that survive are built on what does not depend on her: scene documentation, 911 and body-worn camera audio, witness statements, medical records, and a documented timeline. Add the hearsay exceptions and forfeiture by wrongdoing under Crawford v. Washington, and a recantation stops being the end of the case.

The Defenses You Will Hear

Suspects in strangulation cases tend to say the same few things: it was an accident, it was self-defense, they fought mutually, she did it to herself, or it was consensual. The last one has become common enough that investigators need a plan for it, including the evidence that tests the claim and the case law on consent as a defense to assault.

The other defense is the quietest one: no mark, no crime. It only works when the officer agrees with it.

Where One Course Is Not Enough

Most officers have seen strangulation covered in an hour inside a domestic violence block. That is awareness. It is not investigation. We wrote about the gap in strangulation investigation training and what agencies are missing and in why one DV course is not enough.

Deadly Intent: Investigating Strangulation and Domestic Violence

Deadly Intent is a four-day, 32-hour in-person course from Revelations Training & Investigations that follows a domestic violence case from the first call to the courtroom, with a full day on nonfatal strangulation.

Day 1 builds the foundation: why victims stay, forms of abuse, stalking, and officer safety. Day 2 covers the predominant aggressor, scene and injury photography, digital evidence and search warrants, lethality assessment, and building cases without the victim. Day 3 is strangulation: anatomy, signs and symptoms, the RTI Strangulation Checklist, the common defenses, and the link to homicide. Day 4 covers trauma-informed interviewing, recantation, objective report writing, courtroom testimony, and a capstone case file.

It is hands-on throughout, with 14 exercise sets, scored interview role-plays, and a final examination. The course carries 32 hours of POST credit.

See the full Deadly Intent curriculum. Want it for your department? Deadly Intent is delivered in person at host agencies. See how agency hosting works or contact us.

Not ready for four days? RTI also teaches the two subjects separately as Domestic Violence Criminal Investigations (15 hours) and Strangulation Investigations (8 hours).

Frequently Asked Questions

Can a victim be strangled without any visible injury?
Yes. Research on strangulation cases has found that most victims show no visible injury. That is why the victim’s reported symptoms, the scene, medical findings, and timed follow-up photography carry so much of the case.

Why does nonfatal strangulation matter for homicide risk?
Prior nonfatal strangulation is associated with a substantially higher risk of later intimate partner homicide, which is why it belongs on every lethality assessment.

How do you build a strangulation case if the victim will not cooperate?
Build it on evidence that does not depend on her: scene documentation, 911 and body-worn camera audio, witness statements, medical records, and the hearsay exceptions that apply under Crawford v. Washington, including forfeiture by wrongdoing.