Suspicious packages ought not to be destroyed by explosion or other destructive technique, but should be mechanically disassembled in a safe or remote area. Most of the time, these packages are harmless. The minority of the times that they are real explosives, the precautions taken to insure the safety of everyone around would be sufficient to keep everyone safe in case it explodes.
Prisoners trained in explosive defusing, preferably those sentenced to death, should be allowed to sign up for specific defusing assignments in order to earn money to pay for their crimes.