And, of course, it's gets fuzzier...
While Dr. Mayer felt that the marks may be consistant with stun gun marks, the then talked to Dr. Michael Doberson, who had experience with stun gun marks on victims.
From The Boulder Daily Camera - January 13, 1998.
"They came over and showed me some pictures from the (Ramsey) autopsy and asked for my opinion, whether they could be stun gun injuries," Dobersen recalled. "I told them that they could be; that was a possibility. But there were a lot of things they could do to narrow down the possibilities of what it could be."
Dobersen told Boulder investigators to do what The New Yorker reports they eventually did - measure the distance between the wounds and compare that to stun guns.
"Besides", he added, "the only definitive way to tell if electrocution was involved in JonBenet's death is to re-examine her body and look for very characteristic changes in skin tissue."
"You really can't tell from a photo," Dobersen said.
(Bold emphasis mine)