The Connors family were sentenced in December to a total of nearly 19 years in prison.
They lured vulnerable men off the streets in Nottinghamshire, Leicestershire and Gloucestershire before forcing them into hard labour.
See Rebecca Broxton's report on the day the family were sentenced.
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A woman has been detained on suspicion of conspiracy to commit kidnap and robbery.
The family of Alfie Dingley, 6, have been refused permission to legally use the drug to help control his seizures.
The note was left for paramedics attending an emergency call in Stoke-on-Trent on Sunday morning.