The phrase "abandon a case" is correct and usable in written English.
It can be used in legal contexts or discussions about projects or situations where one decides to stop pursuing a particular matter.
Example: "After careful consideration, the lawyer decided to abandon the case due to lack of evidence."
Alternatives: "drop a case" or "dismiss a case".
The government's decision to abandon a case that prosecutors had once compared to nuclear espionage shattered an uneasy calm that had settled over the Justice Department and the F.B.I. in the waning months of the Clinton presidency.
In 2015, a Guardian investigation revealed that police departments had to sign a non-disclosure agreement with the FBI in order to use Stingray devices which said that police must hide the program's use from defense lawyers and the public, even mandating that they abandon a case if they fear the program's use might be revealed in court.
It was "disturbing," he said, to learn that a legal services lawyer must abandon a case in which the validity of a law or regulation arose and was not permitted even to answer a judge's question about whether a case raised a constitutional issue.
Two years earlier, the Federal Trade Commission had abandoned a case that had sought to break up the nation's major oil companies on the ground that they had engaged in collusive behavior.
In 2010, families in England and Wales had to abandon a court case when their legal aid was withdrawn three weeks before the case was due to begin.
It would be extraordinary if the FBI and/or MPD were successful in convincing a federal prosecutor to abandon a criminal case or to strike lenient plea deals with defendants in cases where a Stingray was used.
In 2011, however, the government was forced to abandon a leaks case against National Security Agency ("NSA") official Thomas Drake when the district court issued a discovery ruling that likely would have resulted in public references at trial to certain NSA activities.
And Planned Parenthood of Kansas and Mid-Missouri questioned whether prosecutors were encouraging conspiracy theories as a way to blame abortion rights supporters while abandoning a losing case.
We already knew that the FBI had successfully hacked the phone when it postponed and later abandoned a legal case against Apple to unlock the phone, but until now, it remained a mystery how it happened.
During the Obama years, they'd been routed, as Google's executive chairman, Eric Schmidt, strongly supported the president, and the Federal Trade Commission abandoned an antitrust case against the company.
The U.S. has stopped several states from developing nuclear weapons, either by threatening to abandon an alliance (in the cases of Taiwan and West Germany), or by threatening, indirectly, to use military force (Libya), or by using it, a perilous course (Iraq).
