The phrase "a necessary precedent" is correct and usable in written English.
It can be used when discussing a situation or decision that serves as an essential example or standard for future actions or judgments.
Example: "The court's ruling established a necessary precedent for similar cases that followed."
Alternatives: "an essential benchmark" or "a crucial example".
For example, such, in my view, is the case with the right to counsel at trial now held a necessary condition precedent to any conviction for a serious crime.
The previous existence of another Times Square marquee, over the former Criterion Theater at 44th Street, provided the necessary precedent that allowed Toys RR" Us to build a sign over the sidewalk outside its store, which includes the space occupied by the Criterion.
It is simply in the nature of precedent, as a necessary component of any system that aspires to fairness and equality, that the substantive law will not shift and spring on such a basis.
Others might say, however, that it is very much the speaker's job to ensure parliamentary procedures are adhered to and that Bercow's use of the precedent is a necessary pushback against May's repeated attempts to pass her deal virtually unchanged.
Valley Forge Christian Academy illustrates that a necessary concomitant of stare decisis is that a precedent is not always expanded to the limit of its logic.
What began as a necessary measure in difficult economic times seems to be setting a scary precedent.
But Mr. Thompson said the commissioner's decision to grant an exception set a precedent and gave the board a strong sense of the credentials necessary for a waiver.
In the Apprendi case, which was decided by a 5-to-4 vote, the majority said that the principle it was establishing did not apply to capital cases, an exception that was necessary to preserve a 1990 precedent, Walton v. Arizona, which had upheld Arizona's death penalty law.
Associate Justice Stephen Breyer remarked that he thought a Supreme Court precedent was not necessary because he thought it obvious that age affects whether a reasonable person would feel free to leave.
But according to Apple, making the modifications necessary in this case would set a dangerous precedent in offering backdoors into users' smartphones.
