How about not releasing them at all?

Feinstein: Halt transfers to Yemen
By Susan Crabtree - 12/29/09 10:53 PM ET
The senior Democrat on the Senate intelligence committee wants no more Guantanamo Bay detainees released to Yemen in the wake of a Christmas Day terrorist attack hatched in that country.
“Guantanamo detainees should not be released to Yemen at this time,” Sen. Dianne Feinstein (D-Calif.) said in a statement. “It is too unstable.”