overcrowding

"We have a huge homeless population, people are living on top of each other, overcrowding, and there is a real opportunity there," she said.

California began placing some convicted felons in county jails in 2011, after the Supreme Court ruled that the overcrowding in state prisons resulted in cruel and unusual punishment.

Even if they did, overcrowding means there’s no shelter to be found or even a space for tents; and Israeli strikes have hit safe zones in the past.

Dr Martin said the policy could further lower vaccination rates in the state, leading to more severe illness and potentially overcrowding hospitals.

"I have been working for the past 20 years. This year is the toughest, because of the overcrowding, the shortage of resources and the shortage of trained staff," she said.