What happens to people who flat line and then comes back?

When a person "Flat Lines" it does not mean that the spirit has left the body, unless the individual has been certified clinically dead. Then the spirit may not leave the body right away. There are many reliable records of people who have died, and many tell the same story of the long tunnel with a bright light at the end. Some have even testified that they have met deceased persons on the other side of the veil before they are sent back to once again inhabit their body.