Used and loved by millions
Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com
agent on the case
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "agent on the case" is correct and usable in written English.
It can be used to refer to a person, typically in a professional context, who is responsible for handling a specific situation or investigation. Example: "The detective assigned as the agent on the case has gathered crucial evidence that could lead to an arrest."
✓ Grammatically correct
News & Media
Wiki
Alternative expressions(3)
Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Human-verified examples from authoritative sources
Exact Expressions
16 human-written examples
"It was like having a good Fujianese F.B.I. agent on the case".
News & Media
Guilty!" above the men's photos — a gift from an F.B.I. agent on the case.
News & Media
Marcus's sister (Ms. Union) is a federal agent on the case, which makes her good bait for the Cuban.
News & Media
Whitehill and Valerie Venegas, the lead agent on the case, also interviewed former Sea Org members in California.
News & Media
In 1997, a new agent on the case requested a permit to eavesdrop electronically on the Lees.
News & Media
An affidavit signed by Paul Harris, an F.B.I. agent on the case, said Donaghy began betting on N.B.A. games, including games he officiated, in 2003.
News & Media
Human-verified similar examples from authoritative sources
Similar Expressions
41 human-written examples
Reyes was one of the agents on the case.
Wiki
He spent hours poring over interview reports and meeting with agents on the case.
News & Media
"We just got on the ground there," he said, adding that agents on the case arrived in the country in the last week.
News & Media
Within days the FBI had deployed 150 agents on the case and Woodward had made his first contact with Felt, who confirmed that the burglary had political implications.
News & Media
A year into the Hillary Clinton server probe, F.B.I. agents on the case concluded that they were unlikely to find evidence to prove criminal intent.
News & Media
Expert writing Tips
Best practice
Use "agent on the case" to clearly indicate the specific individual responsible for handling an investigation or matter. This phrase is suitable for both formal and informal contexts, but is especially common in news and media reporting about legal or investigative matters.
Common error
Avoid using "agent on the case" when referring to a team or group of people. This phrase is intended to identify a single, primary individual, not an entire investigative unit. If referencing a team, consider "agents working on the case" or "the investigative team" instead.
Source & Trust
91%
Authority and reliability
4.5/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "agent on the case" primarily functions as a noun phrase, typically modifying another noun or pronoun to identify the specific individual responsible for handling a particular matter or investigation. As Ludwig AI explains, this is a grammatically sound and commonly used phrase.
Frequent in
News & Media
60%
Wiki
20%
Science
10%
Less common in
Formal & Business
5%
Encyclopedias
3%
Reference
2%
Ludwig's WRAP-UP
In summary, the phrase "agent on the case" is a grammatically correct and commonly used expression to denote the primary individual responsible for an investigation or legal matter. As Ludwig AI confirms, this phrase is frequently found in news and media contexts, but its neutral register allows for broader application. When using this phrase, ensure it accurately reflects a single individual's responsibility, and consider alternatives like "lead investigator" or "case officer" for formal settings. Remember to clarify the scope and context of the investigation to avoid ambiguity. Top authoritative sources like The New York Times and The New Yorker frequently employ this phrase, solidifying its acceptability and understandability.
More alternative expressions(6)
Phrases that express similar concepts, ordered by semantic similarity:
investigator in charge
Emphasizes the investigator's responsibility and control over the case.
lead investigator
Focuses on the investigator's role as the primary person handling the case.
detective assigned to the case
Specifies the detective's role and their assignment to the particular case.
officer handling the investigation
Highlights the officer's role in managing and overseeing the investigation.
the detective in charge
Similar to "investigator in charge", but uses the specific title of detective.
the lead detective
Similar to "lead investigator", but with a more specific job title.
case officer
Short and direct alternative, emphasizing the officer's handling of the case.
primary agent
Highlights the agent's role as the main person working on the case.
point person for the case
Indicates the person who serves as the primary contact for the case.
assigned investigator
Focuses on the investigator's designation to the case.
FAQs
What does "agent on the case" mean?
The phrase "agent on the case" refers to the primary individual responsible for handling a specific investigation, legal matter, or task. It is frequently used in news and media contexts, especially when discussing law enforcement or legal proceedings.
How can I use "agent on the case" in a sentence?
You can use "agent on the case" to identify a specific person leading an investigation. For example, "The lead "investigator in charge" /s/investigator+in+charge stated that they are confident in the evidence gathered by the "agent on the case".
What's a more formal alternative to "agent on the case"?
More formal alternatives include "lead investigator", "case officer", or "primary agent". These terms are suitable for professional or academic writing.
Can I use "agents on the case" to refer to multiple people?
While "agent on the case" refers to an individual, you can use "agents on the case" if you need to refer to multiple people working on the same investigation. However, "agent on the case" emphasizes a specific individual's role.
Editing plus AI, all in one place.
Stop switching between tools. Your AI writing partner for everything—polishing proposals, crafting emails, finding the right tone.
Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Source & Trust
91%
Authority and reliability
4.5/5
Expert rating
Real-world application tested