Meanings of re-use on in English

He then refilled the syringes with saline solution, leaving the needles for the hospital to re-use on patients.

But the site doesn't say why, or warn users that usernames and passwords, which users commonly re-use on other sites, may have been compromised.

Similar attacks on other services often use passwords that are re-used on multiple accounts.

The other two are complete jurisdiction over new-media productions and residuals for made-for-new-media productions that are re-used on new media.