The phrase "a case to prove" is correct and usable in written English.
It can be used when discussing a situation or argument that is intended to demonstrate or establish a particular point or theory.
Example: "The researcher presented a case to prove the effectiveness of the new treatment in clinical trials."
Alternatives: "an argument to demonstrate" or "a point to establish".
They have a case to prove.
"There are actual cases where poor counties didn't have the resources to put on a case to prove where a crime occurred".
So the fact that he has not been tried yet is especially disappointing because it doesn't sound like it'd be that difficult a case to prove.
"Uber became a case to prove out the team," Jett said.
He wrote up negative evaluations about me in order to build a case to prove that I was an incompetent teacher.
The Neo-Conservatives allege the Soviet Union is not following the terms of disarmament between the two countries, and, with the investigation of "Team B", they accumulate a case to prove this with dubious evidence and methods.
In one passage, Judge Sciarrino acknowledged apparent shades of gray in Mr. Nunez's case, writing: "It should be noted that it is reasonable to assume that given that numerous lawyers and countless hours have been spent on what is a fairly complex legal issue, that the prosecution will have a difficult case to prove an actual intent to trespass.
"The circumstances point toward them, but the reality of it is that it's a hard case to prove," a police supervisor said.
it's always a challenge in a bribery case to prove the quid pro quo, to prove that what happened was because of the corrupt deal".
Despite copious evidence of violence in the Bierenbaum marriage -- in one incident, he choked his wife to unconsciousness; in another, he tried to drown her cat -- prosecutors have a difficult case to prove without a body, forensic evidence or eyewitnesses.
"It really made lynching and the Ku Klux Klan possible," said Christopher Waldrep, a historian at San Francisco State University and the author of a forthcoming book about a lawyer who was able, in a rare case, to prove jury discrimination in Mississippi in 1906.
