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Others reported the over-use of medication and sedative injections so the staff could have a quiet shift, leaving patients like "walking zombies".

Jenna said staff would over-use intramuscular sedative injections when patients were in distress.

The substance can cause headaches and make some users anxious or paranoid, while over-use can make people faint or lose consciousness.

The substance - which is sold in metal canisters - can cause headaches and make some users anxious or paranoid, while over-use can make people faint or lose consciousness.

From a neurochemical perspective, "the psychological mechanisms behind 'never wrongs' include a complex web of defensive processes, most commonly the over-use of primary, or lower-order defense mechanisms," Behr added.