“to verify the condition of the saint’s body and find a way to ensure its preservation.”
Why? If the soul has left, isn’t it a useless shell?
Historically speaking, the incorruptibility of the mortal remains is looked at as one of the many signs of sainthood. St. Bernadette of Lourdes body is incorrupt as are many other bodies of saints throughout the ages.
“Why? If the soul has left, isnt it a useless shell?”
Veneration of relics (most often body parts) of saints is nearly as old as The Church. If I recall correctly, and Alex can if I am wrong, such veneration began in 155 AD after the martyrdom of +Polycarp.