When Jesus sent His seventy disciples, these men were not of the same level of teaching as the first twelve, but they were sent by Jesus also. He gave them power not only to heal the sick, but to cast out devils.

         Jesus didn't warn them to protect themselves against demons or instruct them in any particular way to handle evil spirits other than they were to cast them out.

                  This tells us that Christians cannot be possessed of devils or need to fear them; because we have the Holy Spirit in us and they didn't. Jesus hadn't died yet.