Bioshackles were genetically modified plants commonly used on Sixam - the most of ladies have been visiting shacklehouses from time to time for the unique pleasures. However, they couldn't be privately owned. As long as a short 4-8 hours sessions were safe, the longer ones could cause the loss of cognitive functions and temporary dementia. Reversible at  most, but there was a risk, so they were restricted to public, scientific and military purposes. One of them was flatlining the suspects to break their will and any external connections they may have, not uncommon due to telepatic abilities of Sixamians.