First of all, regardless of what Spitz says, marks left by a stun gun aren't usually *burn* marks; the marks are usually abrasions made by electricity dancing across the skin. Doberson & Stratbucker and others have documented that stun guns leave "signature marks", not burns. The marks made by a stun gun can vary a LOT--depending on how close the probes are held to the skin or if they probes are pressed into the skin, how long the electric current touches the skin, the angle the probes are held to the skin, whether both probes (or in a few cases like Boggs, 4 probes) actually touch the skin, etc

Dr Doberson compared the actual stun gun found in a suspect's possesion to the exhumed body of Boggs to demonstrate where the probes had touched the skin and how the probes lined up with the marks found on the skin after death.