Cells merger plan for Bedfordshire, Cambridgeshire and Hertfordshire
21 March 2014 Last updated at 11:51 GMT
The sharing of custody suites is being considered by police and crime commissioners in the East of England as a way of saving money.
The plans would affect people held in Bedfordshire, Cambridgeshire and Hertfordshire.
Critics say the move could affect vulnerable adults and children, and may even end up being more expensive due to increased transport costs.
BBC Look East's home affairs correspondent Sally Chidzoy reports.