that depends on what type you mean, voodoo zombies, or "true" zombies, voodoo zombies are just people who are buried until they suffer brain damage from lack of oxygen after being put into a comatose state with as someone else said puffer fish powder and declared "dead" most likey by an inexperienced coroner, they should still be breathing very slightly and the heart rate should be extremely slow and light easy things to miss, and buried and uncovered, these zombies are still human and can still feel and think and even speak in some cases. And, by saying that they are "under their master's will" they are just susceptible to domination in their current state. They also recognize humans and other "zombies" whereas true zombies kill on sight and dont recognize pain. True zombies feel no pain and are slowly rotting whereas the voodoo zombies are not. They are still alive. Check the works of Max Brooks for documented attacks. He is the author of the zombie survival guide.
The Zombie Survival Guide - Non-Fic, World War Z - Fic. both by Max Brooks