The phrase "approved in writing" is correct and can be used in written English.
You can use it to describe an action that was confirmed in a written document. For example, "The principal approved the school's new policy in writing."
The brochure for the apartment has a confidentiality warning in large type, "These photos may only be distributed to potential buyers that have been approved in writing by the seller".
Any other use of the logos and banners must also be approved in writing by AAAS.
Any changes in authorship must be approved in writing by all of the original authors.
He says a $3.4 million gift from his mother, portrayed as sinister, was part of a gift she approved in writing under the auspices of Sullivan & Cromwell.
When it's finished, the thesis must be approved in writing by the thesis defense committee--which, at Hopkins, is composed of five members, including two from outside the department--before a student is allowed to defend.
For purposes of accountability, each raid should also be approved in writing by an appropriate military official.
Informed consent was obtained from all patients and experiments were performed according to the declaration of Helsinki as approved in written form by the ethical committee of the medical faculty of the Ludwig Maximilians University Munich (LMU 068-08) and the Children's Hospital of the TU Munich (TU 2115/08).
"Migrants at the Southern Border will not be allowed into the United States until their claims are individually approved in court," he wrote.
They were told to hire an ethics monitor who has to approve all deals in writing before they are finalized.
As the final details of the Libertad's voyage were approved in May, a letter written by the foreign affairs secretary and circulated among top officials warned that the ship "could be embargoed by authorities of European member states where there are legal processes against the republic under way, as in the case of Germany, Belgium, Italy and France".
The tax cuts, approved in 2001 and 2003, were written to expire at the end of this year at all income levels.
