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The phrase "was already tested" is correct and usable in written English.
You can use it to refer to something that has been tested in the past in order to indicate that it is no longer necessary to test it again. For example, "The safety features on the car were already tested so we can go ahead and purchase it."
Exact(16)
The AD02 vaccine, developed with British drugmaker GlaxoSmithKline, was already tested for safety and tolerability over the past year.
The drug was already tested in a mixed group of patients, some with mild symptoms and some with more advanced disease.
The approach was already tested in simulation by varying all the parameters of interest as well as on a set-up composed by three marine surface vehicles.
The CB1 antagonist SR 141716A (pharmaceutical name Rimonabant) was already tested in humans in order to investigate the potential ability to reduce subjective intoxication and tachycardia in healthy subjects with a history of marijuana use.
Recent losses to Ivan Dodig and Mardy Fish seemed to have rattled his confidence, confidence that was already tested by his five consecutive losses to new No. 1 Novak Djokovic.
Complex (1) was already tested in preliminary studies toward NO x gas.
Similar(44)
Dr. Hilleman was already testing his own vaccine as the epidemic ended in 1965.
SBC said it was already testing various applications of the network, including working with Microsoft to create digital television services.
FOUNTAIN VALLEY — When Linda Pham's youngest son was just a toddler, she was already testing him.
Children are already tested at primary school.
Pupils are already tested in the last year of primary school.
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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