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"have been previously validated" is correct and usable in written English.
You can use it when referring to something that has already been established or checked. For example: "The theories presented in the paper have been previously validated by other researchers."
Exact(60)
Specific curricula have been previously validated.
All these tests have been previously validated in Spanish.
The content and organization of this kind of training have been previously validated [11].
Overall, bioalerts constitutes an open source python library for the derivation of structural alerts from categorical and continuous data sets using two methodologies that have been previously validated.
Several dynamic indices to predict FR obtained with transthoracic (TTE) and transesophageal echocardiography (TEE) have been previously validated in small populations of septic shock patients.
Candidate scales were recommended for use in clinical trials by the National Institutes of Health (NIH) Chronic GVHD Consensus Conference or have been previously validated in dry eye syndromes.
All these antibodies have been previously validated [11].
The last three genes have been previously validated in human placental malaria [30].
PCR primer sets used in this study have been previously validated and sequences are provided in Supplemental Table S1 and S2 [14] [14].
BD simulations using the SDA program have been previously validated through experimental tests on several other protein systems [26], [31], [32].
SiRNA duplexes were purchased from Invitrogen and have been previously validated [11], catalogue numbers for each duplex are: siRNA 1 – HsiRNA871; siRNA 2 – HSS147872.
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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