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"required proof" is a grammatically correct phrase and it can be used in written English.
It typically refers to evidence or documentation that is necessary or obligatory to support a claim or argument. Example: In order to file a successful insurance claim, the policy holder must provide the company with the required proof of damages, such as receipts, photos, and repair estimates.
Exact(37)
Judge Roush said the insanity defense required proof that Mr. Malvo was categorically incapable of making the distinction.
The F.C.C. required proof that Verizon had sufficiently opened its network to competition on the local level in Pennsylvania.
One juror, Shalisha Martin, noted that the instructions explained that conviction on a charge required proof beyond a reasonable doubt.
Mr. Reedie — who said he had never heard of Ms. Pishchalnikova's email — said he required proof before initiating investigations.
He was behind a 2004 ballot measure that required proof of legal residency for those receiving state services or voting.
Bo and Dena McLain of Milford, Ohio, eloped in March so he could add her to his group policy because her nursing school required proof of insurance.
Similar(16)
The Webster requires proof of employment.
Establishing maintenance -- or alimony -- requires proof, too.
But in case you require proof, see this show.
Criminal courts require proof beyond a reasonable doubt for conviction.
Schools and day care centers require proof of immunization.
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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