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Re:What HP Must Do to Make Amends for Its Self-Destructing P... by jahewson on Tuesday September 27, 2016 @12:27PM (#12590818)
Brother's toner cartridges come with a return shipping label in the box, so you can send back your old cartridge from them to recycle.

I assume they refurbish and refill them and then sell them again.

Re:What HP Must Do to Make Amends for Its Self-Destructing P... by ghostly_s on Tuesday September 27, 2016 @01:54PM (#12591522)
AFAIK all toner cartridges are sold this way. I believe it's simply because there's no practical way to refill toner, which is an extremely messy indelible powder. There are also environmental regulations regarding the disposal of toner.