SELECTED REFORM RESPONSA

A body may be exhumed for a variety of reasons, including reburial in Israel (Shulhan Arukh Yoreh Deah 363.1ff), but not to place a vial of Israeli soil in the coffin. It would be appropriate to sprinkle that soil onto the existing grave without disturbing it, thereby satisfying the wishes of the visiting relative.

"Walter Jacob ,“Questions and Reform Jewish Answers”(New American Responsa (New York : Central Conference of American Rabbis, 1992), No.174.